I dunno online wise 2011 hasn't been very startling for me, sure theres been lots of great releases, but not so much of the multiplayer.
Dead Island is good, I still prefer L4D2, how you can play as the zombies, shame Dead Island hasn't got that, I still think its an alright game though.
Battlefield 3 is good, great I'll admit, but half of the time I have to run to the battlefield itself and its more annoying and tildilating than picking the shrink wrap off the game case/package.
MW3 is alright, as far the COD francise this is so far the most similar installent, compared to its previous,*spoiler* though I did cry when Soap died.
Haven't finished Serious Sam3 campaign yet, haven't even touched on the multiplayer so far.
I suppose overall I'm just not into multiplayer as I used to be and I blame Skyrim... and I woundn't have it any other way!