I've long suspected that Nintendo secretly caters to the illicit pharmaceutical and herbal refreshment crowd, and WarioWare, Inc.: Mega Party Game$ pretty much confirms it. (Note to Nintendo's lawyers: Confirms it solely in the mind of this one cheeky writer. Stop sharpening your pencils.)
Those who missed out on WarioWare, Inc.: Mega MicroGame$ on the GBA will find this their first introduction to the concept of the five-second video game. Each mini-game, thrown at you with a one-word instruction, tasks you with figuring out what you're supposed to do and then doing it, whether it be busting a karate move on a ninja or catching a cat with its eyes closed. Seriously.
Thing is, if you played the GBA's WarioWare to death, there's not a whole lot of reason to pick up the GameCube version, especially if it's primarily the single-player game you're after. Even the party game formats don't add anything truly special to the experience, other than you won't find a multiplayer video game that's quicker or easier to pick up and get into than WarioWare. If all the STRATEGY of Mario Party 5 gets you down, then WarioWare is the title for you. It's a party game in the most literal sense of the word.
If you somehow missed out on WarioWare for the GBA and all its wonderful snot-sniffing, dog-weeping, teeth-brushing madness, then you really ought to give the GameCube version a shot. If not, stick with the one on the wee machine.
A decent party game for the attention deficit disorder crowd, but the single-player game doesn't offer much that you won't have already experienced in the Game Boy Advance version.