Pros:

-Very fun map
-All the weapons available
-Tons of grenade launchers, chainsaws, and M60s
-Buttons that correspond to the kind of fight you want with the infected
-Midnight Riders and Disco!

Cons:

-Mounted Machine gun you can't use?
-Screen freezes after you close saferoom door

Conclusion:

A very fun map that is very useful to test out certain weapons or just killing tons of zombies! It would be awesome if this was a survival map also. 

Pros:

Very original
Great textures for a Mario-concept campaign
Tons of fun to play
Shooting the ? boxes for items
Mario under the pipe
Addictive

Cons:

Very easy to fall off, especially if a Charger or Tank gets you

Conclusion:

A very amazing map. I love how its based off of the Mario series. A very original map, which I like very much about it. Lots and lots of fun!

Pros:

L4D survivors for backup
Lots of creativity put into this map
Good amount of ammo and other weapons
Great spots where turrets should be
Awesome Medevil soundtrack
Lord of the Rings concept
Very large map
Heads-up notices when a specific event happens
Great spot where all those oxygen tanks are
Tons and tons and tons of zombies to be slain

Cons:

Sometimes if you're in a tight squeeze tanks will come barging in and beat the living crap out of you.

Conclusion:

The best survival map I've ever played for L4D2. Possibly the first ever survival map with an ending! Now that is cool!