Pros:

Added a few new ideas that fit well with the game.
Maps are creative and detailed.
Challenging w/o being frustrating.

Cons:

Ending needs something to go from good to great.
Lighting was a bit dark for my taste.

Conclusion:

I really liked this campaign. It felt polished and well thought out. There are a couple added features I felt fit well. One is  that you can "lock-pick" a few rooms for extra goodies. Another is healing venting machines that are spread out just enough to not be "cheap". For the most part is was challenging without being frustrating, though one part in the sewer did get a little "Oh come on!"  I'm glad were were playing on advanced or it might have taken us more than twice to get through. The ending was original, but was a bit easy, and I would have like to kill final "boss".