Pros:

Nice, long challenging campaign
Good amount of Ammo and Health
Love having to work at getting supplies and getting into places
Interesting level design, very well thought out.

Cons:

Only problem I had is game crashed on 3rd map, I believe, the one with the moving crates we had to jump on. Only crashed once. All other times I played it was fine. 

Conclusion:

This campaign  is awesome, truly one of my favorites!!! I had so much fun playing it with my friends. We laughed the whole way through. We all died so many times trying to finish campaign. But we did finish and that finale was AWESOME!!! Great work, looking forward to another campaign from you!!!