I finally got to play the Wii for the first time last night. It was okay, but I really wouldn't consider purchasing one. Wii sports was fun for a bit, but I got bored with it fairly quickly (played bowling and tennis). Rayman was really unimpressive to me. It's a bunch of minigames that aren't much different than the type of stuff you can find on any flash game website outside of using the Wii ontroller. Excite Truck was probably the best of the games I played, but I would put it as a solid 3 out of 5. It was fun, but the game itself was fairly hard to follow and know where you were supposed to be going.
The games were fun, but I can't imagine playing anything but Excite Truck for any period of time. I think last night made up my mind to pick up an Xbox 360, as DOA4 pushed me over the edge in choice.