3DS: ALBW, although Fire Emblem, Devil Summoner: Soul Hackers and SMT IV were all great. Couldn't really get into Pokemon X and haven't bought Ace Attorney 5 yet.
Vita: Killzone: Mercenary was the only game I bought, and if anything on PS+ came out this year I don't remember what (well, Soul Sacrifice, but I've never been a fan of Monster Hunter-type games). Good, but not great; if the netcode was halfway decent it'd be a lot better.
360: Injustice was the only 2013 game I 'bought'; the story's pretty bad and the controls feel a bit clunky to me, so it certainly doesn't win on any other merits.
PS3: Tales of Xillia - excellent game, although the only other 2013 game I have is Dragon's Dogma: Dark Arisen, so it's a bit of a no-brainer that Xillia would win.
Wii U: Wind Waker HD - I'm sure Super Luigi U, Super Mario 3D World, Pikmin 3, and Wonderful 101 are all excellent, but I haven't gotten to play them yet so I can't say much for them. At the moment my Wii U library consists of WWHD, Nintendo Land, Arkham City, and ME3.