Pros:

-Good Layout and Design
-The right amount of infected
-Good item placement

Cons:

-All the map transitions crash the game
-The finale had some missing models and textures
-A bit too short

Conclusion:

I wish this campaign was a bit longer, and you should really fix those map transition crashes. As they were getting pretty annoying.

Pros:

-Unique and Great looking design
-Interesting layout

Cons:

-Too many hordes
-Map 2 is very poorly structured, the bots tend to die most of the time.
-Three events and a tank on Map 2
-Annoyingly placed explosive barrels
-No ammo pile on finale
-Finale is stupidly hard because of the weird layout and ladders

Conclusion:

Map 1 and 3 made this campaign look promising, but then I started to lose hope when we played Map 2, as I had to restart about 5 times due to the nonstop hordes and events. This campaign could use some difficulty tweaks.

Pros:

-Nice design
-It's always clear where to go and what to do next
-Good Finale
-Hilarious and unexpected ending

Cons:

-There is not nearly enough supplies, especially on Map 3
-The fence event on Map 3 is ridiculously hard
-A few missing textures in some areas
-Ammo piles are in stupid spots, like 10 feet from the safe room, and then nowhere else on the whole map.

Conclusion:

This campaign honestly wasn't too bad, however, we were getting frustrated with the placement of supplies, as there really was not that many, I never even found a melee weapon until the finale, and map 3 had barely anything throughout the whole thing. And the first event on map 3 is very poorly designed, as there's an enormous nonstop horde, and theres no supplies other than weapons, making it pretty hard to survive. The finale was pretty good though, even with the large amount of stairs, the amount of infected make it fun.

Pros:

-Interesting surprise events
-Custom music
-The amount of infected seems right

Cons:

-Ugly textures and models
-Finale was a cool concept, but it makes it a lot harder and more tedious
-Bots are braindead in some key areas
-The layout is a little strange and confusing at times

Conclusion:

This campaign wasn't too bad, and the events really took me by surprise. I couldn't help but laugh at all of them. The finale could use some readjusting however.

Pros:

-The last 3 maps had a neat art direction
-The right amount of infected
-Supply crates are a cool concept

Cons:

-EXTREMELY Long, like to a point where it's just obnoxious
-Very large maps and lots of water DO NOT GO TOGETHER!
-It's confusing where to go most of the time
-Confusing finale
-You say the campaign itself is difficult, but all we really found difficult was the finale after you finish surviving.
-The art style is very very bland on most maps

Conclusion:

This campaign was looking good, especially with the supply crates. However, every time we went to a new chapter I kept noticing a pattern of walking enormous distances through water, which is quite boring and repetitive. I really can't stand campaigns where the maps are huge and its just nothing but walking, walking, and more walking with barely any infected in the way. Also there wasn't much of a clear indication of what to do after the finale survival period, and even when we found out where to go, we just had two tanks shoved in our faces.

Pros:

-Interesting design
-Revolver Magnum replacement
-Somewhat well structured

Cons:

-Missing textures in quite a lot of places
-The AK47/Tactical Shotgun skins looked pretty bad and didn't seem necessary
-Extremely long maps
-Why were the chapter thumbnails just screenshots?
-Some textures just honestly looked choppy and bad
-Confusing and poorly structured finale
-Waaaay too many events

Conclusion:

Throughout the campaign I had mixed feelings about it, but the more and more I kept running into untextured models, the more and more I was being disappointed. Also, events can be a good thing, they can. But the fact that there seemed to be one every 5 steps seemed ridiculous. 

Pros:

-Very great looking environment
-Interesting and innovative events
-Lots of places to explore without making it easy to get lost
-Good finale

Cons:

-Too easy 
-Not enough infected

Conclusion:

This is honestly a really nice looking map, its beautiful. The events were really neat, especially the log ride. Overall this campaign was a good experience, however it was a little too easy, as there wasn't many infected. We even turned up the difficulty to expert just to give it SOME challenge.

Pros:

-Neat level design
-Good layout
-Good item/weapon placement
-Fair amount of SI and tanks

Cons:

-Endless and nonstop hordes throughout the whole thing
-Extremely bland finale
-A little too short

Conclusion:

The campaign was pretty enjoyable I guess, but the non-stop hordes were beginning to get frustrating and un-needed. The finale was honestly boring and nothing too exciting happened, we only ran into ONE tank. Also it feels a little too short, even for a 3-map campaign.

Pros:

-Very well structured 
-Neat design and scenery
-The perfect amount of infected to accommodate the length of the maps
-Great finale
-Hilarious ending

Cons:

-The huge amount of pipe bombs at the finale made things a little TOO easy

Conclusion:

I personally had a lot of fun with this campaign, it felt really alive throughout the whole thing. I probably wouldn't mind playing this again someday.

Pros:

-Well structured and well designed
-Custom Tank
-The perfect amount of infected
-It's always clear what to do next
-The best easter egg I've probably seen in a video game

Cons:

-The horde seemed to be a bit excessive on the finale

Conclusion:

This is probably the most well-made campaign I've played. I'd recommend this to anyone who plays L4D2.

Pros:

-Very nice looking and well structured
-Great voice acting
-Secret areas
-Feels like the right amount of infected

Cons:

-Too many tanks
-Slightly difficult finale
-The Labyrinth area was tedious
-Not enough ammo or medkits

Conclusion:

This was a pretty enjoyable experience, the atmosphere looked nice, and it was pretty clear where to go.  The voice acting also sounded well-done. However, the "pretty clear where to go" part vanished when we went into the labyrinth, and those wide open rooms didn't feel like they were needed. It also felt like there was at least 1-2 tanks per map, which is too much honestly. But those cons aren't enough to make the campaign not enjoyable.