Pros:

Yeah, i'm voting this 100 because of idiots who rate quality stuff like this 40.  

There are no custom melee weapons in this campaign. They are simply not there man.  Check your botched riot shield mod install.

 L4D is not a single player game.  It was never designed or intended to be played this way.  Single player mode is sort of an afterthought game mode for people without friends.  Get some friends.

Cons:

This rating system is a complete joke and something needs to be done about it.

Conclusion:

That'll do I think.

Pros:

You are a skilled mapper.  Really thought outside the box.  Really conveyed the idea that you are ascending a building throughout play.  Excellent finale.

Cons:

Too many stairs.  Some more elevators would work well here.  Few optimization issues when outside the building.  But i'm sure that can be worked on.

Conclusion:

Very fun campaign.  Would recommend.