Pros:

-Amazing visuals, you can definitely see the amount of hard work that went into this campaign
-Fantastic design
-Challenging
-Fun
-Has a very dark, eerie atmosphere. I love it.
-Lots of places to explore
-Feels very real (for example, the mountains in the background of the skybox)
-Custom music and models
-A werewolf as a tank? AWESOME!
-Beautiful looking coast in the finale (just had to put that here because I thought it looked absolutely amazing.)
-Fun evens

Cons:

-Fourth map has alot of frequent hordes and special infected spawning, which was a pain in the ass in singleplayer with bots.
-Finale is too easy, I got out of there  twice and easily avoided the tank.
-The l4d2 survivors don't really fit into the atmosphere of the campaign. I know Kev did this because of the storyline and all, but I definitely expected the l4d1 survivors when I saw the screenshots at first.

Conclusion:

I absolutely loved this campaign, it has alot of replay value too. Most of the cons are not a really big deal so it's up to you wether you want to keep it this way or make some minor changes. Either way, everyone should play this campaign! It's fun, challenging, looks absolutely stunningl and has so many surprises, which is exactly what every campaign should have. You guys did an amazing job!

Pros:

-Beautiful looking maps
-Fun
-Cool events
-The l4d1 survivors fit perfectly with the atmosphere
-I really loved the third map
-You nailed the cold atmosphere in the final map, perfectly done.
-Creative and challenging finale

Cons:

-The finale was close to being frustrating. One of the cogs was very far away.
-Not really a fan of the sacrifice finale, but that's just personal preference.

Conclusion:

A fantastic campaign. These are exactly the kind of campaigns that keeps L4D2 alive. 

Pros:

-Fun
-Very challenging
-Great variety of events in each map
-All 4 maps look beautiful, I love the design.
-The moving van from Dead Air mixed with the gas station explosion from No Mercy was very cool.
-The most fun and exciting finale I've ever played so far, it was definitely my most favourite part of the campaign.

Cons:

-One bot got stuck at the finale and wouldn't move, but no point loss for this.

Conclusion:

Fun throughout the whole campaign, loved it from start to finish. Each map was unique in it's own way and had some really exciting events. 

Pros:

Feels very complete.
Fun and has a high replay value.
The lighting is just perfect.
Great design.
Feels very unique and stylish.

Cons:

None

Conclusion:

A must-have campaign. Everyone should play this.

Pros:

-Another quality melee weapon.
-Matches perfectly with the Mack Daddy-O I'm using :>

Cons:

-None

Conclusion:

Once again, you make the best melee weapons. You have my downloads good sir.

Pros:

-IT'S A PICKAXE! (no further explaination needed)

Cons:

-None

Conclusion:

I've been using almost all of your weapon mods and they just keep getting better and better. Lots of people made this clear already but let me just repeat it: you make the best melee weapon mods on l4dmaps.

Pros:

-Custom mutations! Holy shit dude you have no idea how much I love this mod. Whenever I get bored of campaigns I always pick one of the many mutations that are available.

Cons:

-Some  glitches and bugs but not too bad to mention.
-Not really a con, more a suggestion. Could you possible add a solo version for darkness falls? If you still update this.

Conclusion:

I could go on for hours and tell you my favourite mutations in this mod but there's just too many. What I do have to say is that 'United we Stand' in survival is my #1 favourite. At first I didn't know what it did but when the l4d1 survivors spawned 3 seconds later, I was blown away by the epicness. This mod is definitely recommended for those who like a challenge or just want to have fun and screw around.

Pros:

-Very good lighting, dark in areas where it should be dark.
-I've always loved the map design in both Vienna Calling campaigns.
-Good atmosphere.
-L4D1 survivors (always a plus for me)
-It feels very complete and well thought
-Very lenghty
-Meeting l4d2 survivors
-The zoo, my favourite maps in this campaign. I loved this map.
-The storms and weather effects were really good, they fitted right in

Cons:

-First 2 maps were a bit bland.
-The storm made it hard to climb ladders sometimes.

Conclusion:

Great map, every custom campaign fan should play this, also the first one. I had a blast playing this and I still do.

Pros:

-High resolution skins for l4d1 survivors.

Cons:

-None

Conclusion:

I always thought the default skins were a bit low res looking. This makes the survivors look way better and it keeps their original look. 

Have I mentioned yet that I love you?

Pros:

-Amazing attention to detail and the lighting is just perfect.
-Lots of things to explore
-The story tellling of back to school has always been one of the most interesting to me, it really fits in the whole zombie apocalypse thing.
-The color corrections in certain areas are very good.
-Custom tank skins <3
-the custom train at the station looks really cool.
-Lots of randomized events, which always makes me play this over and over again.
-6 maps, holy shit. I love lenghty campaigns.

Cons:

Well, I'm sorry I can't be as specific as valvola.  There weren't really any huge cons for me. (I'm very easily entertained.) and if there were cons, then valvola's review is alot more helpful to you than mine, I'm just here to tell how much I love this campaign.

Conclusion:

This is truly a must-have for anyone who plays custom campaigns. This is one of the most fun and challenging campaigns for l4d2.

Also, yes, everyone should play this.

Pros:

Finally, I can make a review. 
-Gorgeous looking maps
-Amazing detail
-Custom music
-Custom models
-Very dark atmosphere, really catches the zombie apocalypse atmosphere.
-DAT LENS FLARE!
-The underground area in the third map, oh my god it looks soooo preeetty, it reminded me a bit of metro 2033

Cons:

-Not very challenging or hard even on expert
-Not alot of events
-Needs waaay more hordes (but ofcourse this is my opinion)
-I don't know if anyone else feels this way but it just feels like something is missing and it doesn't have as much replay value as other campaigns.
-disappointing ending, just the screen fading to black

Conclusion:

Before I make my conclusion, this is not a bad campaign. I give it an 8 because I just love the amazing design and the amount of effort you all put into this campaign. However, like I said in one of the cons, it's just missing something that doesn't make this the most remarkable campaign. It's missing alot of challenges and events which could bore some people throughout the campaign, if it wasn't for the amazing maps and and the attention to detail it would be a very basic campaign. 

but then again, the amount of effort that went into this campaign is amazing. I was hoping it was just a bit more challenging though and more events. As of right now I really just see this as an eye-candy campaign, which it really shouldn't be considering this is l4d. It needs more hordes, events etc. (but again, this is my personal opinion. I'm a guy who loves a challenging and difficult campaign and this one was just too easy for me to beat.) 

Pros:

It's good to see that someone finally made a third person mod that's actually accurate. I've always prefered playing in third person.

Cons:

The crosshair disappears as you aim further into the distance and in some areas I can't see it really good, which is quite annoying because then I can't see where I'm shooting. 

Conclusion:

I think anyone who prefers third person will love this. If you can try and fix the crosshair issue that would be good. For example, just make it bright red wherever you point it so you can see it where you aim. I'll defintely give it a 10 if this could be fixed.

Pros:

- Great atmosphere, especially at the start in the elevator.
- Custom soundtrack
- Dat ending. When the music starts playing and the color and contrast changes, I got chills running down my spine, and I think that is what you guys were aiming for too.
- Amazing ligting and graphics, very surprised you managed to do this with source.
-  L4D1 survivors yesyesyes!
- Intense
- EXPLOSIONS!
- Fire torna- okay, enough. I think I can't really express in words how much I love this campaign.

Cons:

- It's short, but no point loss for this. The only solution is to just play it again and again and again. 

Conclusion:

Not only one of the best maps here, but one of the most unique maps on l4dmaps. Definitely recommended.(not for slow computers though, lol)

Pros:

-Great model
-Great animations (I !@#$ing love that reload animation)
-Nice sounds
-I like the shells on the side. Am I the only one?
-I definitely feel like a badass when I use this.

Cons:

-None 

Conclusion:

I've used alot of auto shotgun mods but this one is now definitely my favourite. It looks very funky and badass.