This is as big as it gets.
The adventure mode is a let down, given, but thats redeemed through its amazing cast of diverse characters that nintendo fans love. If you own a gamecube and don't own this game, this is the very first game i'd recommend, if your into multiplayer.
For personal one player use however, thats only good for sharpening your skills toward multiplayer. Theirs little things to do to keep you amused with one player for several hours however.