AAA = hype, to most people
Zack & Wiki is a AAA game, but I only know one other Wii owner who has it and I bought it for him (after he tried it and liked it).
I wouldn't call Halo 3 a AAA game for myself because it didn't offer anything new, fun or interesting to me, but five million Americans obviously disagree. HYYYPPPEE
I think it's really weak to categorize a AAA game by critic scores.
But based on that, I think Sony has a lot more "AAA" hype this year than MS/Nintendo. MS is soooo smart to have gotten GTAIV for 360