I currently own a X360 with the Kinect sensor and like to play on Xbox live (anyone here?)
These are what I play:
Kinect Sports
Kinect Adventures
Kinect Joyride
Kinect Dance Central (no really, I'm latin so no wonder I like dancing haha

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Castlevania Lords of Shadow (bought the collector's edition game for 30$ at Futureshop!!! But...didn't have a chance to play it yet)
Left 4 Dead (I'm not a fan of first person shooters, but if it has Zombies, of course I'll play it!)
Left 4 Dead 2
Gi joe The Rise of Cobra (don't have anyone to play it with, and I'll admit it: It's kind of boring to play it alone)
Bio Shock 2 (played it before the first one and I absolutely prefer it: It is such a strange game, which is why it kept me hooked)
Bio Shock (never finished it, I am stuck at the stage where you have to retrieve materials while keeping the right timing in order to avoid being stinged my the bees. Don't tell me the trick if you know it! I also refuse to watch walkthrough's on Youtube, I enjoy neverending challenges)
And I'm also big on old school games which is why I still have my original NES, SNES, Sega Genesis (console is broke) and my PS2. I still play my old games.
My favorite titles are the old Megaman games (1-5), Castlevania (1,2,3, Adventure, Belmont's revenge, Bloodlines, Super CV4, Chronicles, Harmony of Dissonance, Aria of Sorrow, Symphony of the Night), Demon Sword, Battle of Olympus, Master Blaster 1&2, Bionic Commando, Batman 1&2, Gi joe (by Taxan), Double Dragon 2, Ninja Gaiden 1&2, Gradius, Life Force, Super Gradius 3.