Only had time to play a few rounds but impressed so far, easy to forget it's a free modification and start judging it as if I'd paid 40 quid for it!
Gameplay is good, except I'm absolute shit, had a bit of a problem with lag where it'd lag then the screen would go black then fade back in, don't know if it was part of the game but if it was then it needs changing because it's bloody annoying.
Art assets are very, very high quality, the models especially - very impressive, almost professional quality some of them. Textures are nice, some a bit bland but functional and some very nice. Maps are nice too, play quite well (subway and ghost I played) nice flow to them, quite a lot of very small inconsistencies and little bits of lazy mapping and some areas could do with a bit of sprucing, but nothing major or game-breaking, just things someone who is picky like me would pick up on.
Overall very good, probably one of the best multiplayer mods to have been released so far in last few years.
And make it easier for me because I'm really shit and keep on fucking dying.