If you played Crysis 1 and are in search for a sequel, I can not recommend it as such.
The singleplayer of Crysis 2 does not classify well as a sequel, but rather an off drifted fan fic.
The gameplay is quite different due to the changed nano suit and completely different and environment and connections to the story of Crysis 1 or Crysis Warhead are virtually non-existent.
The multiplayer of Crysis 2 also has absolutely nothing to do with Crysis 1 MP or Crysis Wars. Completely different game modes and game mechanics.
If you are just looking for a game to buy:
For singleplayer:
Definately in the upper leagues of today's game market, though you will facepalm on some points because of some all to blatant elements copied from CoD. It's a very smooth game to play as long as you don't play it for the story.
For multiplayer:
MP with guys in nanosuits is still on a similar high fun level as it was in Crysis 1/ Crysis Wars, but atm the bugs and balance problems might ruin it for you.
From time to time you will face very bad hit registration, jumping lagging people, incorrect killcams, bugged gamma rays that make almost everybody just stand still, while you can move, and so on.
Ofc, since this game is new and hip, there are quite of cheaters.
Also if you have a special dislike of CoD-like leveling of your multiplayer account - it is there.
If you want to have a new mp game to play competitively, I can not recommend it, due to the CoD like leveling system, that I think will never change, and naturally, the bad hit reg.
I could go on with this list, but I think you get the point
