Pros:

Creative Crescendo Events
Challenging levels
Fun mini-game built into levels
Excellent Finale that encourages moving around, rather than finding a place to camp and staying there.
Large levels encourage and reward exploration (IE Map 2)

Cons:

Generic:
Item's sometimes spawn in odd/inaccessible locations (Example: Map 3 A molotov and some pills spawned in mid-air behind a pair of chain fences)
Players/Bots are sometimes spawned outside a saferoom, sometimes on the outside of the wrong door.
Bots sometimes cease following a player until the AI teleports them to the player.
Finale:
Smokers can sometimes grab a survivor through a floor.
Shuttle Escape is fairly bland, at least add perhaps a few gas cans that ignite when the shuttle begins taking off.

Conclusion:

An excellent, and somewhat, lengthy campaign with very creative use of game resources to create very good Crescendo's. Again, shuttle escape seems a bit bland, but the finale itself is very nice. Overall I give it a 75/100.
                                                 (50 Base Score + 10 Per Pro, -5 Per Con)