Battlefield 3, even though I don't really like what EA have done with the Premium thing (taking after Activision and CoD elite), but I guess the DLC model is becoming more and more common these days with games. I used to play BF3 heavily on Xbox, now I don't have Gold LIVE anymore and hardly turn the Xbox on. Still play it on PC occasionally, but I suck pretty bad at PC gaming.
CoD was fun for the first few weeks, just like Black Ops. I still prefer Black Ops over MW3 though for the zombies.