Pros:

Good Ideas
Puzzles and traps are nice
Maze is especially good

Cons:

Couldn't find my way out of the 1st part
Most of the campaign is a little empty
Should have 4 chapters instead of 3, that last safe house seems to have been forgotten
And finale is a bit weak, although good
The car is funny though, seems like its sneaking out of the place (couse of how slow it goes) instead of ramming zombies like u'd expect

Conclusion:

All in all is a nice campaign, still needs some changes though.
With a bit of time and love it can become just right