Pros:

Not much

Cons:

Poor AI means that its hard to get through in single player. On the first map, Francis refused to move into the safe room until I threw a molotov at him.
Plenty of parts with empty textures, not missing, simply not there.
Dull and repetitive.
Impossible to know where you are meant to go sometimes. I spent about 20 mins on level 2 trying to find some way to mve on, to no avail. There simply isn't enough telling where you need to go.

Conclusion:

Needs A LOT of work.