I try not to play my worst game of the year, but year after year I fail. This year I have two candidates, that I can remember.
 
The Godfather II
I absolutely hated the first one but thought I'd give this a chance anyway, because that's what I'm like. It is a vast improvement over its predecessor, meaning it's garbage. Basically it has evolved into Saints Row 2, but without the fun, as the fierce, soulless blandness that has come to define the series has survived fully intact. So it's douchey, crass and dull.
 
Guitar Hero 5
The setlist is TERRIBLE, rendering the whole game worthless. My fault for assuming it would be alright and not terrible like in every other Guitar Hero I've played. But alas. Also it turned out I don't really care for the genre any longer. Having wasted €90 on it doesn't make me hate it any less either.