Total waste of money :(
What I've got is very short campaign (only 3 maps, and last one is just Scavenge map ...), no story - you just meet 3 survivors and later find body of the unlucky one. Levels are rather plain and boring, there is nothing that haven't been seen in L4D 1/2 already ...
Fallen survivors and footlockers don't add anything valuable to game play.
I don't know how Valve could release something like this, and what took them so much time to create this DLC. It's kinda sad how they wasted so many great ideas.
Right now I know that they will not fool me again, after Crash Course and The Passing I'll wait for reviews before I'll buy another DLC for any of the L4D games ...