Pros:

-Amazing visuals, you can definitely see the amount of hard work that went into this campaign
-Fantastic design
-Challenging
-Fun
-Has a very dark, eerie atmosphere. I love it.
-Lots of places to explore
-Feels very real (for example, the mountains in the background of the skybox)
-Custom music and models
-A werewolf as a tank? AWESOME!
-Beautiful looking coast in the finale (just had to put that here because I thought it looked absolutely amazing.)
-Fun evens

Cons:

-Fourth map has alot of frequent hordes and special infected spawning, which was a pain in the ass in singleplayer with bots.
-Finale is too easy, I got out of there  twice and easily avoided the tank.
-The l4d2 survivors don't really fit into the atmosphere of the campaign. I know Kev did this because of the storyline and all, but I definitely expected the l4d1 survivors when I saw the screenshots at first.

Conclusion:

I absolutely loved this campaign, it has alot of replay value too. Most of the cons are not a really big deal so it's up to you wether you want to keep it this way or make some minor changes. Either way, everyone should play this campaign! It's fun, challenging, looks absolutely stunningl and has so many surprises, which is exactly what every campaign should have. You guys did an amazing job!