I'm on the fence regarding shelling out ~$300 for the wii, an extra remote, and an extra nunchuck. I do most of my gaming on PC and recently picked up an x360 which doesn't really get much playtime. The games released for the x360 don't really justify its price tag (yes, I'm talking about gears of war too). I'm really into FPS, RTS, third person action, and driving/snowboarding games.
I'm interested in the wii because I think it has the potential to entertain a lot of friends who come over who normally wouldn't go near my x360 (let alone my pc).