Pros:

Epic in length
Fun, unique events
Challenging
"The Twins"
Probably my second favorite
Strong story

Cons:

Exhaustive length, -not a casual map

Conclusion:

This is one of the best custom campaigns you can get. Just download it.

Pros:

Unique environments
Superb map design
Out of the box map design, especially on the ship
At the end, I said "What is this? A L4D2 map for ants?!"  ; )
Challenging, need to plan with your group for the end
Custom music
Fun, surprise ending

Cons:

Can't think of any

Conclusion:

My favorite map, of all the highly rated campaigns I've played. 

Pros:

Different
Cool concept

Cons:

Too many zombies
Absolutely without question not do-able with default AI

Conclusion:

Need to pull back on the zombies. Or just make it a survival map instead. If I had wanted to play survival, I would have picked "survival" in the game's main menu.