That was ... wierd. I just finished voting in the AusGamers game of the year and, although I've played well over 50 different games this year, I found myself skipping almost all the categories. Shooters? Nup, only TF2 needs to be on my rotation to get my fill. Racing? Lots of that, but GT5 is leaving a sour taste in my mouth, and TM Nations is the only one I've been constantly going back to. Handhelds? No iPhone games in the list, and too many to really pull one out (maybe NinJump, but that's really because it's currently in the frontal cortex).
One thing I did notice was that of the AAA games I did own that made the list I felt a little underwhelmed by, which makes giving the nod to a game I didn't even buy seem overly optimistic about how they play too.
I felt the same way when surveying the roguelike game of the year voting over at ASCII Dreams. I played a handful, but really didn't have a standout apart from returning to the well of Dwarf Fortress again and again.
Maybe it's the whole indie scene that gets game of the year?
In a couple more days I'll do a time based summary of the year by tallying up the GameLogs. I'm of the opinion that the game that can keep my attention the longest is as likely a candidate as any for GotY. I'm guessing League of Legends will be one of the frontrunners, and I'm happy with that.