Most played would be Skyrim on the Xbox 360. I've been going back and picking up some old quest and different story lines and talents that I didn't try the first time.
Next one would be Assassin's Creed IV - Black Flag on my Xbox One. Great game, really liked it.
Honorable Mention would be Child of Light, Lego Marven Super Heroes and Jurassic World on my Xbox One. With a shout out to Dance Central (III and Spotlight.)