I'm still playing Crysis 2 Multiplayer. You can get a game on Team Deathmatchm, although no-one seems to play any of the other modes which is a shame, Crash Site was good. Also if you get it don't bother buying any of the additional DLC maps. Absolutely
NO-ONE is playing them. I bought the Decimation pack the other day and have yet to get a single game on it.
If you want to add me as a friend to play feel free. There seems to be a small dedicated community out there, it's not as easy as COD to play, and the suit can take some getting used to, but it is very satisfying, there are rarely any lucky kills.