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.
Haven't played other versions of it, but THUG is as advertised. Controls really intuitive, graphics fine (although there is a wee bit of slowdown)... great. And I haven't seen SSBM under $25, but I'd still get it at that.