I play a lot of shooters. 412 hours in BF3, 300 plus in BC2... ArmA, CoD, every Halo save Wars, Planetside, Far Cry 3... The list goes pretty far back.
I played my fair share of Call of Duty before Modern Warfare and after, but I can't stomach arcade shooters much anymore. There's no teamwork and little strategy involved. Even the dinkiest ArmA mission is more enjoyable. I still hop into BF3 from time to time since it's easy to get in a round and shut off my brain, letting instinct take over.
I play a pretty wide selection of other games as well, like Minecraft, Dwarf Fortress, GW2, Elder Scrolls stuff... There's just something about the shooter genre that I enjoy. The competition between players and testing your responses when you barely have time to think are appealing to me. And when you have a few friends on VOIP -for example- providing close air support... it can be a special thing. There's a certain camaraderie doing that sort of thing with people you know and trust. Can make for some hilarious emergent gameplay as well.