Pros:

- Stage diversity
-Well structured map sequence
-Car crash on map 2
-Wrecked train on the final map
-Nice custom intro and voice on the radio
-Good length 
-Godspeed You! Black Emperor reference

Cons:

-Really really really dark sometimes (in terms of lightning) specially during the first two maps
-Some bugs with stairs ( the first ones on the concrete tunnel, and the circular ones to exit the sewers ((bots got caught twice in there and I had to restart stage))) 
-As much reviewers have already stated, the length of the Woods stage is very short, altough good.

Conclusion:

Very good enjoyable campaign. If you are looking for a breeze of fresh air to your left 4 dead expirience you came to the wrong place, because this maps delivers nothing new (enviorment wise), but if you are looking for a extremely solid pack of action and some glorious moments of zombie slaughtering and tank hunting, you are in for a  pretty amazing sweet campaing. Totally worth the Download :)