Pros:

- great, lovely detailed & beautiful environments
- holy hell that mansion is stupidly cool
- good pacing overall
- nicely difficult overall
- nice open environments to move around
- no dumb bottlenecks

Cons:

- some odd mission structure (avoidable tanks, odd events, confusing levels)
- one mission is a confusing roundabout; not particularly friendly to newbies
- last mission can be a bit too difficult

Conclusion:

This campaign is right up there with Back 2 School as one of the best add-ons for L4D2 ever made.