Buying a game and discovering you hate it, did it happen to you this year?
Personally, I bought Demigod when it was on sale on Steam, and really regretted it. I am a seasoned LoL player, and there is just no reason for me to play this steaming log of poo. I also bought Arma 2 and had a lot of trouble, mostly with bugs, and general unpleasantness with the control and AI. That's my experience anyway.
So, what's the WORST game you bought this year?