IGN Cube has a "first look" at WarioWare for the Gamecube. Its not just a straight port, as Nintendo has opted add a multiplayer mode, which should only serve to make the game even more insane. Sounds to me like Nintendo may have made yet another classic four-player party game.
Splinter Cell is very good from what I've seen and VERY hard. Unlike MGS where you can alternate between carnage and stealth, you MUST use stealth here. Other good games include: Halo (duh), Sega GT 2002 (nearly as good as GT: 3)