Pros:

- Great Atmosphere
- Good Setting
- A really good soundtrack
- Good voices
- Map 2 and 3 are fun 
- A lot to explore

Cons:

- Quite a few FPS problems
- Feels a bit generic
- First Map is repetitive to the point of being boring
- Special Infected music just ends after a few seconds
- Repetitive, easy finale
- It ends before you even reach the truck

Conclusion:

Overall i can see that a lot of work and time was spent on this but it has quite a few flaws. The first level is a bit boring: go into a shop, trigger an alarm, get the fuse...repeat and repeat. 
The middle 2  were very good though, i liked the eerie atmosphere in the third level. Sadly that was also the level were i had the most FPS problems, i've never had that low FPS before in any L4d2 Campaign. 

The finale was a let down, repeat the same thing a couple of times, fight horde after horde with some tanks mixed in and it wasn't even challenging. Than it ends at the middle of the stairs with some lame panning over a room - while you hear the Bots still fighting.