Considering I didn't care much for the "story" in WarioWare (I guess it'd be part of the charm and all that, but seriously, all I cared about were the minigames), I guess the GameCube version would be up my alley. I've only played the first Warioware on GBA. But the fast pace and vague rules ("Detonate! Shake! Potato!") are the point of the game, to respond quickly to whatever crazy thing they throw at you. They're simple enough that the one-word description is usually enough for you to know what to do. Still, there have been some minigames that I had to play over and over to figure out how to play, such as that one where the little stick guy has to bounce on a trampoline but the controls are reversed.
Chup, are you saying that Warioware and Wario Land are not in competition? Absolutely, they're completely different games. Although personally I think they should have stopped at Wario Land 3. Liked the first one for the varied environments and some of the music (such as the train levels), but I prefer the second and third ones for having smart level design. You try to do anything to break the game and you won't be able to do it because a block or wall is placed just so to prevent you from doing that. Then you find out five minutes later there's a hidden wall you can break through. On top of that, the control's tighter and you can't die, so you never truly get stuck anywhere (unless you've wasted all your coins trying to pass that golf minigame). Only downside is that all the music in Wario Land 2 and 3 sounded similar to me, none of them really stand out. Well, except for "Out of the Woods" from 3 because it showed up in Mario's Tennis for the Wario Court.