Pros:

* Nice Enviroment
* Non-Linear Maps
* Good amount of supplies, witch is good for long maps like the ones you get here
* Interesting tasks to complete (I would suggest a more logical order on PC parts to scavenge )
* Good Music (If you ask me)

Cons:

* Endless hordes
* Zombies spawns from rare places during the second  half of map 1
* computer parts layout and order, (although it's an interesting idea)
* finale with a powerfull m60 against 2 very weak tanks
(somehow, I guess it's compensating for those endless hordes before, but it isn't working)

Conclusion:

By correcting "cons" this would be a very funny and interesting campaign, otherwise it can be frustrating to play, especially for non-experts.