Pros:

1-Excellent variety for the atmospheres
2-Nice special effects
3-Unique secrets
4-Creative boss battles
5-Creative use of boxes
6-Humor
7-The original audio of Crash Bandicoot (nice touch)
8-Interesting vendors
9-Awesome ending
10- Good variety of zombies

Cons:

Versus mode needs immense work, I am beginning to question if the author even intended for this campaign to have a versus mode, if not, I suggest he make it so you cannot access the mode from the main menu.

Conclusion:

Essentially this was a really good campaign in just about every aspect.