Pros:

- Bug Free (4/5) [Bots don't see ammo piles as ammo piles]
- Unique (5/5) [Unique Idea for a L4D2 Map]
- Gameplay (4/5) [Need more weapons.]

Cons:

- Replayable (3/5) [Pretty much the same every time.]
- Bots (3/5) [Some what stupid, in addition to what I mentioned.]

Conclusion:

Good idea for a map, would be excellent if you added more weapons, possibly changed the path that the payload could go every time. Fix the ammo pile bug. 

Pros:

- Bug Free (10/10)
- Unique (13/15) [Unique Environment, but the elevator was the only exciting thing.]
- Fun Gameplay (24/30) [Fun, but not enough of a challenge.]
- Environment (24/25) [Fun to explore, wish there was more in the parking garage though.]

Cons:

- Bots (7/10) [Bots are somewhat stupid.]

Conclusion:

You should try and fix up the bots a little bit, add something more innovative that changes gameplay, escalators maybe. Too many powerful weapons in the starting area, move them somewhere else, your map has a lot of vistas, make use, have people explore for the weapons. Also, you should close off some areas until rescue is called, or its easy to just go around and grab the powerful weapons before you start. (ie: M60)

Pros:

Mostly Bug Free
Alot of Weapons, Fun.

Cons:

Poor Environment Design
Very little challenge
Low Replaying Incentive
Poor Game Element Design

Conclusion:

An okay map, fun for just playing around, but not good for anything challenging, or interesting. I was disappointed.

Pros:

Excellent Environments (A)
Unique Ideas (B)
Large Levels (B)
Unique Ending (B)

Cons:

Areas that were not necessary, but had no rewards for exploring. (C-)
Not enough guides (F)
Limited Weapon choice on some maps. (C+)
Some Glitches (C)
Confusing Storyline (C)

Conclusion:

I think that you've done a fair job. Your campaign is unique but has its faults, and is better then most I've tried.