Pros:

-Reminds of Blood Harvest
-Intense(on any kind of difficulty)
-Nice tricky spot in map 2(The barrels falling down the hill)
-Long maps
-Finale is really fun

Cons:

-More health items spawned,perhaps?
-Similar/same finale as Dead Air
-Umm in the ending scene there are 2 planes flying out?

Conclusion:

A successful combination of Dead Air and Blood Harvest.I can see why L4D1 players love this campaign.The tight paths and all the darkness make this ideal for Versus(please release a version for vs play :) ) and it can dish out some challenge even in modes like Normal and Hard.
A+ for the work, dude.