I'm playing it now... not sure yet. Parts of it are excellent. I like the look, feel, and sound of the weapons. Player models are ok. Movement seems slow, but is probably realistic. Game play is hitchy online, and I have seen a number of object-placement artifacts, such as a night vision scope floating six inches over someone's head.
I also like that it is a serious game. If you get killed you're out of the round. However, that plus the nade-spamming tards and the 30 gazillion snipers can be a bit frustrating. I am also pretty sure I have been shot through walls a couple of times, including concrete ones that you shouldn't be able to shoot through.