Pros:

Great design
Very original
Neat locations
Lengthy
Many humorous signs

Cons:

Slight problems with the navigation mesh on the 4th and 2nd levels

Conclusion:

This is a very, very, very good Left 4 Dead campaign and is probably the best one yet. The stadium is an awesome location and riding the train is a very memorable moment. This campaign is just, wonderful.

Pros:

Looks magnificent
Great design
Very original
Neat ideas
Well executed
Fun finale

Cons:

The 1st and 3rd levels can be very confusing
You can go of the elevator and get stuck with no way to get back up

Conclusion:

This is a beta? When I played this it felt like it was 101% complete! This map is very good. I have very little complaints, and besides the complaints I do have, this map is perfect. The 1st and 3rd levels are confusing, but fix the elevator, and this map will be just a little more enjoyable.