I honestly never liked the cod series since it's all point and shoot. Like I know that's more realistic, but if I can just point my gun in a general direction and continue to get kills, it doesn't take much skill to me.
I normally don't play much xbox live anymore, but when I do it's normally either GTA IV, R6V2, or Halo 3. Left4Dead is fun online if you get a good team. I heard there is going to be a need R6 game so i'm hoping that will be good.