Pros:

-Beautiful maps with a great atmosphere.
-First 3 maps had great balance. 
-The werewolf tanks. Very scary. 
-Custom music was awesome. 
-Interesting take on a finale and the event with the barking dog.
-I liked the bone melee weapons. 
-Did I mention beautiful maps? :D

Cons:

-Map 4 :/ Overly long and downright tedious with the short time between hordes. And doesn't seem to fit with the rest of the campaign, no matter how cool it looks (and it does look really really cool).
-Levels 4 and 5 were dramatically more difficult than what came before. We played on expert realism which was great for the first 3 maps, but not for the last 2. 

Conclusion:

Amazing campaign in terms of looks and atmosphere, really beautiful and ambitious. Enjoyable to play with the exception of map 4 and arguably the finale (depending on which difficulty you play). Well worth taking the time to play because it really is a gorgeous campaign with an amazing atmosphere.