Mine was Tomb Raider, I couldnt get into it, played for about 4 hours (bored). It just felt to ordinary to me and didn't live up to the hype imo, I also encounted some weird bugs while playing it. One of the bugs which happened to me twice at the same spot was when I killed a guy and his body disappeared he then turned into an invisible man wielding two axes. I tried to kill him but he was invincible aswell as invisible xD he then chased me and killed me in one hit, I reloaded and the same thing happened! I was already bored of the game at this stage so I couldn't be bothered trying it for a third time lol
Its not the worst game I've played of all time but for 2013 so far it takes the cake.
Maybe you've already forgotten that you've played this year. Heres a list of this years releases.http://en.wikipedia.org/wiki/2013_in_video_gaming