Well it depends what console really, since I've got quite a few games on the go at the same time, lol.
On 360 I'm playing Halo 4, but only MP, never really been into the singleplayer of the series, and I only bought it so my mates would shut up, since they were essentially bullying me into getting it, lol. I also frequent Gears of War 3 MP too, since y'know, Gears has some of the best MP gameplay this gen.
On PS3 (And VitA) I'm playing Playstation All-Stars Battle Royale, it's REALLY fun, still haven't finished it with everyone though, but meh, mostly playing for the MP too... anyways, also playing Black Ops 2 MP with a buddy of mine, but he's raping the fuck out of it, I've not even hit max level yet and he's prestiged three times and over halfway to doing it again, lol.
On Vita I'm playing Assassin's Creed III: Liberation, it's good, but there's a few issues that stop it being anywhere near as good as the home console versions, they're mainly technical though, but it does feel a tad watered down, even if all the features are there... I'm also playing Gravity Rush and Resistance: Burning Skies (... Still, lol) Oh, and LittleBigPlanet Vita, currently in the middle of making a pretty badass level with some really cool touch mechanics and stuff.
On PSP (Well, PSP games on Vita) I'm in the middle of Persona 3 Portable, my first Persona game and I'm loving it to pieces to be honest, can't wait for Persona 4 Golden to release over here! I'm also playing through Final Fantasy IX (PSOne but whatever...) since y'know, it's the second best game in the series (Final Fantasy X takes that place, hands down!)
On 3DS I'm playing Professor Layton and the Miracle Mask, it's surprisingly fun, my first Layton game, think I might buy the others... and Pokémon White (DS but shush) too, and I'm still playing Theatrhythm every so often too, I take it to work with me on occasion because it's a brilliant game and fun to play in short bursts.
I've got a combined total of over 300 games (Nearing the 350 mark) for PS3, Vita, PSP, 3DS, DS, and 360, and if you add my PC games onto that total, jesus christ, I've got SO MANY D:
Not playing anything on the PC at the moment though, I DID try to play Dishonored yesterday, but holy fuck it just bored me so much, lol. I play a lot of Battlefield 3 on PC, and have quite a collection of games on Steam too.
I mostly play RPG's, JRPG more specifically, but there are a few WRPG's I enjoy, not a huge fan of Skyrim, despite really enjoying Oblivion, but after attempting to play it so many times, I eventually started enjoying Fallout 3, and enjoyed Fallout: New Vegas a lot more too. Strategy games are also pretty cool too, right now I've got a playthrough of Civ 5 going, and RTS games are fun too, Red Alert 2 being my favourite RTS of all time, lol.