Dead or Alive 5 (360). This year has been awesome for fighting games (Soul Calibur V, Tekken Tag Tournament 2, Persona 4: Arena, King of Fighters XIII, Skullgirls, and Dead or Alive 5). Fuck SF X Tekken.
Even on the easy difficulty, the last boss in arcade mode is a major pain in the backside, but extremely satisfying when you beat her. I've had to use numerous continues just because Jun/Unknown continually juggle you in the air and you can't tag out.