Pros:

- Valve quality map
- Fantastic weapon and ammo dump placement
- A lot of molotov's and pipebombs
- Pleanty gas tanks placed in the right place (even valve don't do that)
- Very good level design
- Great map for versus
- Gautlet finale
- Everything takes in the dark
- Campaign takes in the city.

Cons:

- One tank in finale

Conclusion:

A must play map.

Pros:

- Long maps
- Spliting paths
- Custom sounds
- Custom paintings
- Gauntlet finale
- Creepy atmosphere
- Nice emoticons over entrance of a tunnel

Cons:

- Low ammo
- Low trowable items (I play on realism so I can't see them through half of the map)
- Few parts could do with some clutering
- There could be more gas tanks
- Pits in the finale could have the hanging safety feature

Conclusion:

A well made map. 
I played it on realism so I probably missed a lot of items.

Pros:

- Good level design
- Good clutering
- All campaign takes place in a city. No jumping from area to area
- Doors that you can look through but not open (neat idea)
- Characters talk

Cons:

- Supply placement is very bad.
- Low quality textures right next to high quality textures
- Further buildings don't have any textures
- Further buildings are more brighter then closer
- Entire finale*
- In the first map the horde is way to big

Conclusion:

Fustrating but good map.

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* Personaly I don't like scavenge finale's. They are boring and repetitive especialy if you play alone. This is a custom map and not a lot of people have this campaign.

Pros:

Very detailed work

Long maps

The train part is fantastic idea

Original events and game objects

Good voice acting

Cons:

Could use more molotovs and pipebombs 

There could be more ammo dumps or scatered weapons 

The train escape hole could be bigger. The train platform also could be biger. Bots fall of it. Also wen the train is moving you can't help your friend up.

Conclusion:

A must play map for all L4D players. Also Valve could take tip's from this map especialy the train part.