Pros:

Maps have a traditional L4D feel to them
Train pass through was very nice
Bots didn't get stuck or confused

Cons:

Some common had a weird blue color overlay on them on map1
Custom car models don't fit into the L4D world at all
Switch at the end of map2 was hard to find as it didn't emit a glow, and the cut-scene didn't fit into the L4D world, I felt like I was watching the "Fast and the Furious"
Map 3 streets are way too cluttered at the start
Finale made no sense and the boat doesn't make a get away, it just sits there
Didn't see one special infected on the finale, I believe they were stuck behind one of the storage/container trailers as I heard a boomer but never saw him

Conclusion:

Good campaign overall, it can be made into a great one with some work.

Pros:

Good performance
Maps look gorgeous
Best custom campaign poster I have ever seen
Great structure to the maps, never got lost
Great voice acting, sounded professional
Great custom music, again it sounded professional
Great subtle mix of humor
Mall looked amazing, really felt like I was in one
Events were unique, fun, and required teamwork
Finale holdout area really felt like something from a zombie apocalypse
Finale cut scene put a huge smile on my face

Cons:

Tank spawn upon attempting to enter the mall for the first time didn't seem natural
The furniture store cut-scene wasn't that great
Survivors got stuck upon attempting to enter the mall for the first time, as if there was something blocking them (happened on a second play though, was easily fixed with a restart) 

Conclusion:

Easily the best custom campaign I have ever played, even better than "I Hate Mountains" IMO.  I was hesitant of downloading this custom campaign at first due to it's file size and not so good reviews right at the top, but man, I definitely regret that.  Don't hesitate at all to get this master piece!   Also, I am very picky when it comes to aesthetics in a map,  I am always finding things that seem out of place to me in 99.8% of custom campaigns (that .2% that seem perfect are DBD and IHM), but this campaign was very pleasing on my eyes.  

How people can rate this with a score of 50 is mind-boggling to me. 

Please give us the directors cut for L4D1!