Pros:

The finale; mind-blowing, inane, great view of the city, two-parts, frantic, did I mention mind blowing?

Variety of environments; building tops, subways and sewers, street level, Did not have a bland 2-D landscape that other campaigns can sometimes have

Continuing from the last point, the city seemed so authentic, not just a cheap rehash of a well known area that people can recognize.

Cons:

I don''t know if I was impatient or not, but the third map's event seemed to last for a while longer than it needed to and seemed like a Gauntlet Crescendo Event. If it was, there was no tooltip telling me to run like hell. If it wasn't, please feel free to call me an impatient (insert derogatory coment here).

I forget which map (might be the 2nd), but the part where the players can break the storefront to steal some guns, the bots don't take them.

Conclusion:

What can I say? This campaign rocked! I don't always play L4D2, but this campaign just made my day.