I've been in to all sorts down the years but as the PC gaming market has died down and seems to have lost a lot of it's imagination I find myself going back to online multiplayer First Person Shooters quite a lot. I used to play CS Source back in the day but slowly lost interest. I decided to check out the latest incarnation CS:GO. I must say they've done a great job of it!
Of course I still play Halo too.
I used to play a lot of MMO's like WoW and Guild-Wars 2 but I gave up because they just consumed too much of my time.
So yeh FPS at the moment for me, with perhaps a bit of Strategy gaming once in a while. I'm really looking forward to Warhammer Total War at the moment.