Pros:

Most are realistic.
Some are funny.

Cons:

Some of the images are too clean and crisp which takes you out of L4D2 immersion.
Some are too low quality and unpleasing to the eye.
There's nudity. Not a bad thing per se, but it's not in the description.

Conclusion:

Although most of it is good, the mixture of bad quality and super-clean/HD images just take me out of the immersion too much for me to leave it as a permanent mod.

Pros:

The top-notch custom content! (Duh!)
Easy to understand what to do, even for non-MC players.
Extremely, extremely fun.

Cons:

Bots are extremely stupid on this map.
Crafted items has a small tendency to get stuck for a brief moment or two after being created.

Conclusion:

I feared I wouldn't be able to understand what to do since I've never played Minecraft, but I was pleasantly surprised to find out I was wrong. There was these... moments where you will get a initial shock of fear and I really liked that. (Won't spoil the when or what.) It's really an amazing  campaign.