I find myself somehow juggling several games, all at various stages of completion:
Infamous - Just got to The Warrens and I'm steadily tearing though side missions. I'm kind of suprised at how much fun I'm having with this one!
Gravity Rush - Picked it up again after a few months off. Like Infamous, I'm mostly hitting sidequests.
Warhammer 40,000: Space Marine - Funfunfun, and really great as a pick-up-and-play-whenever sort of thing. Plays much better / kb + mouse than with a controller.
Dead or Alive 5 + Mortal Kombat - I've put plenty of time into both already, but my roommate and I spent several hours playing vs. matches on Wednesday night. Roughly around 90 matches total between the two, and I won around 80 :p
I'd started Twilight Princess and Armored Core V, just to check them out, but will probably wait to put any serious time in. Impressions so far are that TP starts out boring as hell, and ACV is totally awesome, but I wish it were a bit less dark brown/dark grey/black everywhere sometimes, as it gets tough to see what's going on.