Pros:

-Great environment
-Variation in level designs provides for unique gameplay

Cons:

-Hordes seem ENDLESS 
-The bots tend to die on the underwater part on the 2nd level, one goes down, they all go down trying to save each other
-Final map is bugged, if you get the cans before starting, it puts the hordes/tanks in an endless cycle
-Some fps drops on 3rd map

Conclusion:

Fun campaign but the amount of zombies seems just RIDICULOUS in some situations. The random car in the first level is a little pet peeve of mine just due to the fact that it's...there but that's just my opinion. The underwater part is a bit too challenging due to the fact that it's so easy to get stuck down there and even easier for the bots. And that major bug at the end of the campaign just tends to upset it as well.

Pros:

-Wonderful Story!
-Love the custom weapons
-Great Music
-Quotes from survivors that actually make sense
-Not too hard or too easy

Cons:

-No icon for custom weapons
-A bit on the laggy side (but that may just be me)
-A few missing models

Conclusion:

This story is phenominal, and honestly I could see it in the roster of real campaigns from the game. My only real gripes with it are the lack of icons for the weapons, I usually forget they're there. Also it's a bit laggy, but my computer's not the best so it's probably just me.