One of the Essentials

Death Woods is one of the very first custom campaign maps I have ever played in Left 4 Dead 2. It helped establish in my mind what community-made maps can be. Death Woods has relatively more unique surroundings and events. When other maps would use gas tanks and fuel cans to clear a path, Death Woods would have you detonate an in-game explosive. There are more examples but I'd rather have you experience it yourself than me spoiling it.

I played this with my friends, full house, so I'm not sure how bots behave in this map. 

Downside, I guess, is tanks didn't spawn much when we played this. And there's little or even no interaction between the characters. No dialogue nor banter.

Overall, really good map that has memorable scenarios. When you're tired of simple doors with alarms and you just gotta run from point A to B, give this map a try.

Here's a snippet of our gameplay: https://youtu.be/qbv5lkkG8Qo

Environment Needs Some Events With It

The environment of the game is really well done. There's really the sense of being in a train yard, you can feel that way while playing the map. It's a huge plus for this campaign, but, it's also being held back by lack of events. Me and my friends played this and not a single tank spawned on the first and second chapter. The only tanks we encountered were on the finale. The campaign can also use some extension. It's quite short, but if the author of the map really intends for it to be short, then I guess it's okay.

Other selling points of this add-on campaign are the custom weapons and how the voice lines of the characters were used.

By the way, here's a snippet of our gameplay. Showing the crescendo events within Blood Tracks: http://bit.ly/2yjAyfi

Even When You Don't Get The Easter Eggs

This is a well-crafted campaign that you can enjoy even when you haven't played any Half-life game before. The gameplay and the experience of the map itself without the references is enough. From the environments, crescendo, gauntlet events and even supplies distribution. What I liked the most about this campaign is the music on chapter four and the way the weather changes on one of the earlier chapters - it starts to rain and you can see the shift in the skybox and the visibility going really low. It has some touch of realism to it. Played this with my friends and I can say that it's a map worth replaying. Here's a short video of me and my friends' gameplay in this map:
https://www.youtube.com/watch?v=wFRxBF2Jf0g

A Short and Well-Crafted Campaign

No glitches, bugs and errors. All crescendo and gauntlet events work properly and I assume, as intended. Played with two friends and one bot, didn't notice any navigation flaws. Resources are scattered evenly and properly to reward those who actually explore. In my opinion, the selling point of this game is its length. The campaign only has three chapters and each of them are relatively short compared to most community-made campaigns. Even at the short duration you can play this map, it can still give a unique experience. Especially how the outdoor environments are made, on how dark it is and the placement of doodads and small details. Great campaign overall, worth replaying. Here's a snippet of me and my friends' gameplay of the map showcasing the crescendo events of the map and the possible tank encounters:
https://www.youtube.com/watch?v=Vn3XZZve_qk

One Of The "Must-Play"s

This is one of those must-play add-on campaigns for Left 4 Dead 2. Me and my friends have played this for quite so many times now. It really lives up to what it offers. The environment and the feel it gives off to the players as you climb up the mountain. There were also nothing wrong with the crescendo events, horde spawns, supplies distribution and tank/witch placements. I wanna give this only a 4.5 out of 5 because the finale was quite easy but it's not possible, so just take this 5/5 instead. :D
By the way, here's a snippet of me and my friends' experience in Devil Mountain:
https://www.youtube.com/watch?v=aSSBAkWXRUY

A Good Portrayal

I'd get the usual stuff out of the way first; this add-on campaign doesn't have any bug and glitches when we played it. There were three of us and one character was an AI, we didn't notice any navigation issues as well. The distribution of supplies, frequency of hordes and special infected spawn are all normal. One thing that makes this map stand out is the atmosphere and vibe of the surroundings. Other maps that has good design tend to be 'too alive' or 'too dead' for a zombie apocalypse. I think Carried Off has hi the balance between the two. A great map overall that has given me and my friends quite an experience. Here's a snippet of our gameplay:
https://www.youtube.com/watch?v=PEecw0jpyiY
https://www.youtube.com/watch?v=oNTPsVWAoYI

Only Downside is Campaign Length

The title says it, the only downside I can say about this map is the length. All aspects, from supplies distribution to map design to crescendo mechanics are all well-done. Not all add-on campaigns under urban settings can pull of the right ambiance and feel to it. Red City does it just right with the amount of routes, rooms you can enter and even the placement of objects on the streets. A great campaign, I just wish it had two or three more chapters in it.
Here's a snippet of the experience me and my friends had with this map:
https://www.youtube.com/watch?v=B0IwiA6cx5A

Unexpected

At first, I thought that this would be just a simple No Mercy but reversed. No other touches and no other changes, but I was wrong. Things have been added into the game more than the necessary stuff (e.g. things needed to be able to climb out of the sewer, back into the streets.). This is also way better than the other reversed original campaigns by Valve, the resources are evenly scattered and is scarce but enough. I'm not sure if the witch and tank placements are random or they were planned but if they are, the creators had done great. Overall, the campaign gives a fresh experience to a campaign me and my friends have played hundreds of times before. Here's a snippet of our gameplay: https://www.youtube.com/watch?v=MVU_MQDifgg

A Good Run in Valencia

I haven't played the first version so I can't make a review as a comparison of this version to that. Everything in the surroundings are just detailed enough except the buildings on the first few chapters. It quite breaks the immersion of being in Valencia - when you look at the buildings and they're just a series of rows and columns of windows. But everything else looks great. Nothing to complain about the frequency of rooms and supplies. Unlike other add-on campaigns, this one really rewards those who explore. If there's one gameplay aspect that came up as a con for me, it'll be the crescendo events. There were two that tells you to turn off something to stop the horde, but when you reach the end of the path, it's already the saferoom. No alarms nor music players. In conclusion, me and my friends still had a good time playing this campaign. Here's a snippet of our gameplay: http://bit.ly/2mBfNFg

Good Balance on Everything

This is one of those few maps that doesn't bombard you with hordes just to label itself a "difficult" map. Also not one of those maps that has doodads in every corner and every space available just to be "detailed". Source of Infection has a good amount and lack thereof of map components which makes it good. The difficulty curve from first to the last chapter is steady with different kinds of events that are just enough to be doable with a small margin for mistakes. Another small thing I liked about the map is it quite tells a narrative with the details of the place which is the "source of infection". Tanks and special infected-s in glass displays will make you wonder if it'll suddenly move and attack you. I don't know if this was intended or not but a thing that can do some work is the scarcity of bile bombs. Another thing is the finale, the radio room itself is a more than a viable camping place for the survivors. The high grounds throughout that last chapter seemed useless

Character Model Spawn Glitches

When we spawned for the third chapter, a friend of ours playing as coach is hanging outside the saferoom on ground level. So we decided to restart the chapter by killing ourselves with a molotov. When the chapter restarted, we spawned right in front of the door for the saferoom we needed to go to. We just skipped an entire chapter. This may also be the 'cause of why there were no ammo piles on the finale.

Good Design But There's Something Wrong With The Hordes

Listen to what other reviews on what they say about how beautifully made the surroundings are. But there's something wrong with the horde spawn. They're infinite and the special infected also trigger them. You're also not allowed to turn around because all of a sudden there will be common infected-s behind you. Doesn't seem to happen to everyone but something bad that happens randomly is still bad.

1/5 for a 1.0 version

This map at it's current state is just barely playable. On chapter 1, no problems were encountered. On chapter 2, one of my friends were immediately on the saferoom that we needed to reach, because he died on chapter 1. Chapter 3 doesn't have that much going on. On finale, the door locks back and we are forced to restart the chapter. There were also no indicators on the escape truck that it is the "helicopter" on the other side. There were also no hordes during the run and no SI, too. There were also no campaign stats.

Not So Chinese China Sometimes

Let me get this out of the way first; the map has no bugs, no glitches, all the event mechanics work properly, the resources are scattered evenly and the hordes aren't too thick or too thin. Aspects of the map that can do some work is the design, game instructor text, and the difficulty balancing. There are parts of the map that are just too bland, there are almost no details, the only stuff that tells you that you're in China is a signage or two. Then there are parts where there's music and the structures you'll see's in a very Chinese setting. The thing about the difficulty balancing is the first two chapters are too easy. It's all move, then horde, move, then horde, repeat. There's also no game instructor text on an event in Chapter 2.

Fairly enjoyable. All in all. Here's a snippet of a gameplay with my friends: 
http://bit.ly/2mHrSsG - Tank encounters and crescendo events.
http://bit.ly/2lhDg1T - Finale.

5/5

Almost everything's perfectly done. The map design's obviously been given enormous attention to detail, from ground to skyboxes. Supplies are generously scattered if you know where to look. The crescendo events are not like those in some other maps that are just ridiculous (Just so they can be labeled as 'difficult'). No bugs, no glitches and the game instructor pop-ups tell exactly what needs to be done - on the right time.

The only thing that can do some more work is the scarcity of melee weapons and optimization in some areas. Still giving this great and outstanding map a 5 out of 5 for the developer's working on it.

Good Mechanics, Dead Times

This map introduces some sort of new mechanics or things to do to end a chapter/reach a safe room. It's this map's selling point but it's undermined by how there's so many dead times this campaign has. I played this with my friends and I found myself just melee rushing the third to last chapters. It just has so many long empty roads that has no to little design on the sides.

One of the first and the best.

This custom campaign is one of the very first maps I've played after getting bored of the original campaigns and it did not disappoint. It's also one or the only map that has a chapter in it that has limited ammo. It just felt right, 'cause I don't really imagine offices having a huge stockpile of ammunition.

Good Environment Balance

There are some maps where you'll find yourself surrounded by trees and swamps all the time and other maps where you'll always be in hallways. Maps with design like that can get boring and can feel lengthy more than they are.

This map has got quite a bit of good balance when it comes to that. A decent map overall, enjoyable with some parts you just can't breeze through.

Gives the Left 4 Dead 1 Feel

A decent map with quite the low difficulty and skill requirement. Map design looks very similar to Death Toll, Blood Harvest and Dead Air for the finale. Totally understandable since this is originally a custom map for Left 4 Dead 1. Good port, no bugs, glitches and good distribution of melee and other weapons from Left 4 Dead 2

A Little Almost There

Then entirety of the campaign is just at that 'alright' level of polish, I don't know if that's a good thing or a bad thing. I may appreciate the said 'random'-s in the description maybe when me and my friends give this map another go. But for the first run, there's not much to it. The highlight and selling point of this campaign is the finale. Somewhat unique rescue vehicle. Haven't played other campaigns that made use of one.

Restroom Shenanigans

This map can be a bit challenging if you're not well-versed in running thru hordes and the feeling of having to run to the other side of the map to get to point X. This map and its every chapter has events that makes it seem like the entire campaign is a rescue chapter. Add to this the different things you can find when you open unsuspecting restroom doors. Another thing to appreciate is the acting done in the end. Although the voice could use a bit more work. I'm pretty sure I can't be that calm in an apocalyptic situation.

4/5 Give this a try. With friends.

Nothing New But

There's nothing new to experience in this map but it's also well-made. I won't bother putting up a pros-and-cons list. Just give this map a go if you want a decent custom campaign map.

Mini Campaign Indeed

Giving this one a 4 out of 5 simply because it delivers what it states. A very short campaign, Christmas-themed and not much else. Also liked what was done to the common infected. 

Can't give it a full 5 stars because it's quite easy and the act of lighting up the Christmas Tree could have been something more. Resources are also everywhere.

First One's Better But Still Great

Good work on reusing the same places and routes without it feeling too 'meh' right after playing the first map. And the reason why so is clearly shown at the very beginning of the campaign.

Watch out for the finale of this one.
10/10 Finale.

I highly recommend playing this one right after playing the first Beldurra campaign.

There's Detail Here

Me and my friends have played a lot of custom maps; and most of them just can't give this feel of "you're in a freaking zombie apocalypse". Even some of those that were in urban settings. The attention to detail on every chapter, the way the cars on the roads looked like there really were some chaotic things that happened there.

If I got any dislike for this map, it's the lack of variety of weapons. I only found a crowbar, night stick, and a baseball bat for melee.

4/5 - Just give this a try.

Innovative Opening Chapter

Pros:
1. New stuff here, especially on the first chapter. Most of the custom maps don't give you an option 
on  how to access the safe room at the end of an chapter. Go stealth or go loud. Your choice.
2. The outdoor parts are open but not too large enough that every path can mislead you to from
the right one.

Everything else is quite the average. Well made, no glitches, no bugs and no missing textures.

Beware of Soldiers

Pros:
1. Having to be aware of soldiers shooting at you is a great addition and is quite unique.
2. The indoor environments are very well done.
3. The resources are evenly distributed and is more than enough if  you just know how to explore.
4. Another unique feature of this map is the finale. It ain't the usual camp and defend or run to the X on the other side of the map.

Cons:
1. Missing textures. I know the fix is on the linked content. But having to have that still feels like a con for me.
2. All the chapters, except the finale are not exactly challenging.

Something in the Lighting and Missing Textures

Pros:
1. Level progression is balanced, no area looks repetitive and lengthy.
2. Supplies are fairly scattered.
3. All panic events and mechanisms run smoothly.

Cons:
1. The lighting could have used more work, especially on the first chapter.
2. The environment could use more details feel a little more alive.
3. There are parts where the tank can just get stuck.

Overall, the campaign's well made just enough to be memorable. Especially when you're tired of finale chapters in churches, forests, rooftops and army installations.

Worth a Part of Your Day

Pros:

1. Despite the file size being relatively small, the map's got a detailed and busy environment.
2. Daylight gradually turning into night in each chapter is a nice touch.
3. All panic events and mechanisms run smoothly.
4. No bug, glitches and/or crashes on our playthrough.
5. Resources are evenly scattered and were just enough.
6. Somewhat unique finale.

Cons:

1. There are parts of the map that just tries too hard.
eg. The ending part of the bridge where you have to slide down and there were holes.

Something like that may have been better off with Questionable Ethics and other similar maps.