assassins creed was my biggest letdown this year. bioshock wasn't as good as it was supposed to be, it was just system shock for casuals.
PS3-uncharted
haven't played it but it sure is pretty :P
360-orange box
the awesomeness of portal pushes this game just infront of mass effect for my 360 GOTY.
wii-SMG
i haven't played a game this good in 10 years. miyamoto hasn't lost his touch.