Pros:

great textures but too crowdy to really have the possibility to apreciate maps details

Cons:

- frustrating (too tight maps and areas for fighting huge hordes and special infected: tanks, smokers, witches, spitters, attacking sometimes all togather)
- really really short levels
- too much witches placed in narrow passages (and difficuty was set to normal)
- quite impossible finale (killed about 8 tanks and an huge ammount of zombies and special infected before being killed)

Conclusion:

the worst campaign I have ever played for the moment

Pros:

the best campaign ever tried

Cons:

sometimes too hard even with normal difficulty (at the end of level 3 and finale)

Conclusion:

must try