I have an Xbox 360 and a Wii. And I would never, ever consider taking GTA4 over Mario Kart, although I'm excited to play through GTA 4. I imagine a lot of people who don't have Mario Kart Wii, or aren't planning on playing it, would never understand this, as GTA 4 seems to be that sort of gamer's paramount game.
The reason is this: GTA 4 will be fun for a few days, or maybe even a few weeks. But Mario Kart Wii will still be awesome two, three, or four years from now. And it will still be getting plenty of play time. Hell, me and my girl still played Mario Kart: Double Dash on our Wii fairly often up until recently. It's insane -- we'd have a fun, shiny new game and we'd go back to a few matches of Double Dash because it was just so damn fun.
GTA 4 looks like a great experience. But Mario Kart Wii is just a lot of damn fun.
