Super Smash Bros. Brawl.
No, I honestly see this becoming the game to beat.
Have you checked out the website yet?
Huge amount of content, and that's just the stuff they're willing to talk about.
Yeah, online's not gonna light the world on fire, in fact, I'm pretty pissed at Nintendo's babysitting approach to how I play my games online, is it really so bad to at least talk to the other people you're playing against?
But even with the online being a big letdown, the game itself is just so loaded with things to do, stuff to collect, secrets to find, and, of course, is pure, simple fun; I really can't see why any other game should be Game of the Year if they aren't as much fun.
Other games may be more artistic, may let you enjoy an engrossing story, may have better visuals and sound, and may overshadow this game in depth and complexity, but when it comes time to bring over three friends and sit down with a game that's guaranteed to be fun, SSBB will always be the first choice, hands down.