Wii sports - Very fun game, I love baseball, and the others are fun too. Might get old soon, but right now, loads of fun.
Red Steel - Honestly not as bad as everyone says. Pretty fun, and cool controls. Sword fighting is repetitive, but again, not too bad. It's one of those games you will play one level of, and come back for later.
WarioWare - Tons of fun, randomness, crazy, and cool. Japanese randomness at it's finist. And fun to play with people around.
Godfather - Awesome game with the controls, everything that would be button mashing in the older games, becomes more fun with motion sensing.
More coming later on Zelda, Sonic and the secret rings, Wiiplay, and whatever games I might rent.