Pros:

-Full campaign
-Rolling credenso moment in L4D1 
-Custom sprays and textures. 
-Versus

Cons:

-Too big, no tips where players should go.
-Not logital, tell me where you saw shool with classrooms without desk for teachers, and internior walls with naked brick?
- Too easy to fall out the map. (Mostly on 2 map).
-Too hard to find second weapons and even pistols, tell my why it's so hard to add more second pistols?!
-Too long, 1 chapter should be for 15 minutes, not for 30 min
-I most moments, street seems to be too empty.

Conclusion:

Well, looks good on screenshot, but its not that same good ingame.