Zelda -- I wasn't dying to play this game, but I bought it because I'm a huge Zelda fan. After an hour of playing I'm completely hooked. The controls are amazing, and make the game feel completely fresh. So far the story and style of the game is taking the series in a whole new direction, and I love it. From what I've seen so far, anyone who buys a Wii should get their hands on a copy of this game.
Red Steel -- I've been incredibly underwhelmed by this game so far. A big issue is that the graphics are pretty crappy (even compared to Gamecube games). I'm still getting used to the controls, but I feel like I'm constantly fighting them. Hopefully things will get better, but right now this game just isn't doing it for me.
DBZ: Tenkaichi -- I played this for an hour or so last night. There is a massive learnng curve in getting used to the controls. I have a feeling that it will actually be pretty fun once I get past that. Luckily, you can also plug in Gamecube controllers to play the game.
Wii Sports -- This game comes bundled with every Wii. It's an absolute blast, and should be the first thing that you play.
I love the interface for the system itself... the whole "Mii" thing is pretty cool. I'm going to get a classic controller tonight so that I can download a few snes games.
I am very impressed with the Wii. There is obviously a lot of room for improvement, but the potential seems limitless. I'm fighting the urge to go out and buy more games just for the sake of seeing how other games take advantage of the controllers.