Pros:

- Large Maps
- Some Events interesting
- Nice idea of everymap
- Challenges

Cons:

- Low fps when playing
- Bug Tank in final map (couldn't escape)

Conclusion:

Good Campaign, Nice Ideas, everybody need to play this campaign :D
Need Support L4D2 :D

Pros:

- Nice maps
- Interesting Design
- No Bugs 
- Rescue Finale nice
- Simulate very real

Cons:

- some models not appear
- some points in camp , bots don't know away to go

Conclusion:

No ideas , No matters , Utouchable . This is Perfect Campaign.