Pros:

+ Great fun map
 + Good amount of weapons, ammo, melee, and throwables
 + Nice twist on the normal finale

Cons:

- A little on the easy side, but still a challenge
 - I don't know if it was just us, but the smokers on the finale were godlike.  They seemed to be able to hit you while completely behind cover

Conclusion:

5 stars, awesome map, definitely a keeper.

Pros:

- Fun Tank Arena map
 - Moustachio is a fun touch
 - Interesting take on an alternative to the spawn closet for dead players

Cons:

- Not enough items scattered around the map
 - Difference between Easy and Normal is too big.  On Easy, there are maybe 6 tanks at once and you can usually kill them down to 2, whereas Normal there are about 11 and you can maybe kill them down to 8 if you are lucky.  Need to either make Easy harder or Normal easier.

Conclusion:

Overall a very fun map.  4/5, could be 5/5 if the Easy-Normal difficulty jump is fixed.

Pros:

- Great map, nice new take on the Let's Build idea

Cons:

- The helicopter is pretty surrounded by trees, and it seems like there is a hoard spawn point right on top of it

Conclusion:

- Get the fence up first!!
 - There is another dock on the other side of the island, so hit both before going into the compound
 - Sometimes items are inside the tents, and hidden well, so be sure to look in every corner
 - Once you get the fence up, the commons can't come inside, so you can relax a bit

Pros:

 - For the first time I actually like gnome chompsky!
 - Very creating use of gnome
 - Nice level layout
 - Seriously, the gnome was awesome

Cons:

 - Didn't really see what the time warp cube did
 - The 4th stage was a little too hard to see in my opinion, minor nit-pick though
 - The first time we played the bots were completely useless, the second time they actually followed and were helpful
 - Very little ammo along the way, making it a mostly pistol/magnum map

Conclusion:

Crashed right after leaving the safe room!  RAGE!!  Oh wait, it says right there that the HL2 texture pack is incompatible.  Works fine now :D

New spin on L4D2, very fun, very awesome campaign.

Pros:

 - STATS!  It actually had stats!!!
 - Very fun tank on the Tank Fever theme
 - Very open and lots of pathways
 - You can shoot out some of the glass to drown the tanks (just don't let them drown you!)
 - Lots and lots of tanks (we had 15 at one time)

Cons:

Really not many cons, the only one that comes to mind is there are a few ledges that I wanted to run off but ended up hanging on instead.

Conclusion:

Great map!  It can be done with 2, but much easier and more fun with 3-4.

Pros:

 - Levels are very beautiful to look at
 - The actual finale was pretty fun

Cons:

 - Invisible walls EVERYWHERE
 - Very few items in the levels, you have to do a lot of exploring just to find any
 - There are often two routes through the levels, which seem like a good idea, but ends up seeming scatterbrained
 - Hard to figure out where to go, almost no directions and the navigation is not intuitive
 - You are constantly having to drop down, which is good because it means you are actually progressing, but is very annoying when a special infected magically pops up and downs the guy who was a second too slow
 - The finale level was weird, you get to what looks like the finale area but end up running through it, drop down a few times, then reach the actual finale area

Conclusion:

I have to disagree with a lot of the other reviewers.  While I did find the campaign very beautiful to look at and it is clear that the author put a lot of time into the maps, it just wasn't that fun to play.  The third map was okay and the finale event was fun, but the rest of it was plain frustrating.  Sorry.

Pros:

 - Very fun
 - Different
 - Encourages you to look around, lots of items in crates
 - Very long (about 3-4 hours)
 - Most of the water can be avoided

Cons:

 - Tons of water
 - The finale is very difficult (we usually play Advanced and finally beat it on Easy, though we might have managed on Normal with a little luck)

Conclusion:

Fun map, just be sure to have a lot of time or break it into a few nights.

PS: BE SURE TO DOWNLOAD THE TEXTURE PACK!

Pros:

 - Fun
 - Beautiful graphics
 - Short (about 1/2 hour)
 - Great memories of Disney World
 - Log ride on map 4 was awesome
 - Finale was a new twist on gas cans

Cons:

 - Map 3 was a little too dark (personal preference)
 - We crashed a few time, not sure if it was the map or user error

Conclusion:

The campaign was a bit on the easy side, but an absolute joy to play.  Highly recommended!

Pros:

 - Lots of special infected
 - Very fun campaign
 - Cool that map 3 is a partly running backward through map 2, but enough differences that it isn't repetitive

Cons:

 - Seriously lots of special infected
 - Map 2 is a bit long
 - Finale is very difficult

Conclusion:

Overall a very enjoyable campaign.  It is on the difficult end of the spectrum.  Had to restart several times, so it did take a while.

Pros:

 - Very fun and original map
 - Lots of special infected, but not too difficult
 - Fun level design
 - Good amount of guns, ammo, and throwables

Cons:

 - Too dark in some places
 - A few of the levels were a little bit long

Conclusion:

Overall, awesome!

Pros:

 - More tank fun

Cons:

 - Glitched often, where after the resupply break the music would start for a second, then stop and the tanks would not spawn.  Usually around wave 6 or 7.

Conclusion:

Fun but glitchy, would be awesome once the glitches are fixed.

Pros:

 - Fun map
 - Nice and short, about 40 min
 - Had no issues with crashes

Cons:

 - A little on the easy side
 - The second map is very open, not really a con

Conclusion:

A nice fun map.  Some people apparently had issues with the finale, but we actually thought it on the easy side.

Pros:

 - Very fun and quick map
 - Each level had a different layout
 - Maps 2-6 had a good quantity of guns / throwables / heals

Cons:

 - Finale door should open inward
 - Map 1 was a bit lacking in supplies

Conclusion:

 - Very fun and short campaign, finished in 58 minutes with 2 restarts.

Pros:

 - It is just 3 maps, but feels like 5
 - Plenty of weapons, throwables, and respawn closets
 - Echoing the other reviews, the map is gorgeous, feels very original and new
 - The difficulty level was spot on, difficult but not annoying

Cons:

 - Finale could use a few more items

Conclusion:

Great map, one of the best in a while.  For your first campaign, you knocked it out of the park.

Pros:

 - The first few maps had a Dead Island feel which was pretty cool
 - Fun map
 - Starts off easy and slowly gets harder
 - The weather on the fourth map was very cool looking
 - Lots of guns and melees throughout

Cons:

 - The fourth map was kinda laggy, I'm guessing due to the weather, worth the coolness but still a slight con
 - Could not find the rescue vehicle, it sounded like a train but we didn't see where to go
 - Ammo was a bit tight on the fourth and fifth map

Conclusion:

 - The fourth map did have a few hard to find obstacles: the ladder on the billboard pole and the pickup next the trailer
 - Some people reported game crashed, but we didn't have any issues

Pros:

 - Very original
 - Fun
 - Awesome finale
 - Great music
 - Excellent level design

Cons:

 - Finale is crazy hard

Conclusion:

PLAY THIS MAP

Pros:

 - Star Trek!
 - Fun map

Cons:

 - Need more maps
 - The bots barely made it on the elevator, maybe make it bigger
 - The finale was a bit on the easy side
 - Also, the finale lagged a bit

Conclusion:

Overall, great start.  Please make more!

Pros:

 - Let's Build!!
 - It has stats
 - Really fun

Cons:

None really

Conclusion:

 - Some of the parts are hard to find, so you have to search around

Pros:

 - Let's Build Map, so automatically awesome
 - New research order
 - Lots of buildable stuff
 - Low gravity when outside

Cons:

 - Rocket button doesn't disable
 - No indication of progress building the rocket
 - No clear indication that you can go outside

Conclusion:

Great map, will be awesome when complete.  Main complaint is not knowing where or when the rocket is done.

Pros:

 - Great layout
 - Good difficulty
 - Nice fence placement

Cons:

 - Sometimes a tank spawn really early
 - Buggy :(

Conclusion:

Overall a great Let's Build map.  The only problem is it keeps crashing on us.  Usually at the wheel on the lower level off to the right, but sometimes while researching.  If it were less buggy would be on the of the best Let's Build maps.

Pros:

 - It's a Let's Build map, which are always fun
 - Lots of stuff to build

Cons:

 - Too hard (3 people on Easy took 2 hours)
 - Constant hoards (at least put a couple seconds between them)
 - Hoards while Tank is spawned
 - Tanks too frequent
 - Need to add a zombie cap (crashed twice due to too many zombies)

Conclusion:

Great map, but needs to be dialed down a bit

Pros:

 - Lots of tanks
 - Common hoards every few minutes to keep things interesting
 - Tons of supplies
 - Re-spawn closet
 - Lots of supplies

Cons:

 - No stats :(
 - The wooden bridge access to the safe room is just a bit too impossible, recommend removing one or two trigger events from that area

Conclusion:

Awesome map, still fun a year later.  If this had stats it would be 10/10.

Pros:

Stargate
Puzzles were fun
Good difficulty

Cons:

Buttons stayed highlighted after you use them
Dialog was too quite, can barely be heard
Ending cutscene explosion crashes the game

Conclusion:

Awesome campaign, just a few bugs that are annoying but don't take away from the overall fun.

Pros:

 - Overall very fun

Cons:

 - Finale is way to hard

Conclusion:

Overall fun map.  We didn't have any issues with crashing (which is common for us).

The finale map is very spread out, which is bad in and of itself.  The issue we had was the special infected spawn rate was super high, like 4-6 with every hoard on Advanced.  We switched to Normal and it was down to the usual spawn rate.

Pros:

Fun map
Beautiful graphics
Very difficult

Cons:

Kept crashing
Very difficult

Conclusion:

Fun map but kept crashing every time we finished a level.

Also, there were a lot of hoards, as other people said, but a difficult map just means that you lower the difficulty, not give the map a low score.

5/10, it would probably be a 8-9/10 if it didn't crash

Pros:

-Building
-Really fun
-Low gravity is interesting
-Auto-turrets

Cons:

-When there are lots of zombies it starts to lag pretty bad

Conclusion:

-The bots are terrible, suggest 3 or 4 humans
-If you keep a stead supply of bile + molly the lag doesn't get too bad

Pros:

I have to agree with another review that I read:
The first couple maps are really good.
The design is creative.
The maps are difficult but not impossible nor boring.
Well thought out.

Cons:

The second to last mast was all storms, which I don't really like, but that is personal preference.

Two BIG cons:
1) It felt like I spent a lot of time with 1 zombie on my back.  As soon as I killed it, another one would come out of nowhere.  My whole team felt like this.
2) The finale was way to hard.  We usually play on advanced and barely beat it on normal.  Complete lack of pills/shots.  Two tanks with water everywhere.  Plus special infected and hoards while the tanks were chasing us.

Conclusion:

Beginning maps are fun but the finale sort of ruins it.  It is more than impossibly difficult, it is annoying and not fun.

If the finale were changed it would probably be an 8 or 9.