I bought it. Total CS purists don't like it (obviously) but I think it's really fun and it brings a much needed graphics and physics update to a well-loved classic. I still spend almost all of my time on it playing Gun Game though.
It does. However, I suck at it
The strategy is different. Team play is a must and the gameplay is a lot clunkier and more realistic. My skill set is making constant split second decisions on how to get the upper hand on opponents, predicting spawn patterns, bunny-hopping, drop-shooting, effective killstreak management, and finding a loadout that best suits a particular map. I still have hella videos from back when I was recording my MW2 playing. My best loadout was UMP .45 with a holosight, stun nades (which actually were extremely useful if you knew how to utilize them), C4 (another typically overlooked item, it's really pro actually), Marathon Pro, Stopping Power Pro, and Ninja Pro. I didn't use a silencer, people get attracted to the red dot and feed you more kills. Running around in circles makes people spawn near you and you get to pick them off continually.
Eventually I got so good it wasn't fun anymore. I would ask other people in the game to give me one weapon, and only one weapon to play the entire round with. I'd still win every time, even with just a throwing knife. :|