Pros:

+ Not your average run-through-zombies campaign
+ Maps are challenging
+ Very different design-wise
+ Ending was awesome

Cons:

- Somewhat bland, though I'm sure that was the intent
- Platforming isn't really suited to L4D, especially when the game forces you to just hang off ledges, helpless
- Somewhat long a bit frustrating at times

Conclusion:

A fun and challenging campaign with a few problems, but no major issues. Oh, and do your best to avoid playing with bots.

Pros:

+ Lots of defensive locations
+ Lots to explore
+ Well designed/detailed

Cons:

- Occasional framerate stutter in main house

Conclusion:

Lots of cool places to explore, though there are some framerate issues in the main house. An otherwise flawless map.

Pros:

+ interesting theme for a map
+ Bright areas
+ Sweet skybox

Cons:

- Not much detail, bland
- bots have trouble with ledges
- Too many pitch-black areas
- No interesting environments or events
- ending was pretty uninspired

Conclusion:

Decent map, but lack of interesting events/environments will keep me from replaying. The amount of darkness in this map made me desperately take in as much sunlight as possible. Not sure if that's good or bad.

Pros:

+ Well-detailed

Cons:

- No ammo piles in safe houses
- Too many special infected
- Finale was very confusing, ridiculously unbalanced
- During the finale, I began glitching rapidly in and out of the floor

Conclusion:

Decent - though overly-populated - campaign until the finale,  nothing to write home about.