Pros:

-custom stuff
-good length
-decently fun to play

Cons:

-nav errors
-lighting is super bland
-some areas look bland
-some sound is too low to hear
-the repairing the computer event was the worst and most annoying part of the campaign that made me almost just quit because it is way too long and you keep going back the the same spots over and over again

Conclusion:

It's alright, but there are serious flaws. This campaign, to be honest, needs a lot of work. The lighting is god awful, and the fact that it's l4d2 makes the fact worse (as l4d2 has amazing lighting effects). you need to work on this a lot, otherwise this will be a sort of crappy campaign