Guys, seriously. Cry2 multiplayer is like, scifi CoD. It has the leveling system, the perks, leveling up your perks, the killstreak rewards, the death streak rewards, the custom classes, the gun attachments and ****. The only difference between Cry2 and CoD is 2 suit functions, and the fact that Cry2 uses made up future guns.
Oh, and I'm not saying CoD is the best mp FPS, that goes to the battlefield series. I'm just saying in the setup they've designed, they do it better than the imitators.
Quote from one of the Crysis 2 developers (he was asked to list the positive points of Crysis 2, this was one of them):
'yes it’s CoD-like, “and what?”, that is what I want to say to people who complain

. Personally I really have fun with my friends in this CoD-like multiplayer (but really improved thanks to the nanosuit).'
full interview here: http://www.fpstime.com/2011/04/crysis-2-%E2%80%93-what-an-ex-developer-of-the-game-thinks-about-it-exclusive-interview/
Personally I think it's a mix of COD and Halo... leaning more towards Halo (seeing as the Crysis 2 suit/weapon combo pretty much has all the Reach Armour Abilities in one.. amongst other similarities).