I haven't played any WarioWare games before but this might change that. I thought that this series was kinda dumb and just had quick easy minigames but the minigames were actually challenging at certain points and the game is just full of charm. I feel like this is one of those games I can go back to over and over again and never get bored.
Mega Microgames retrofitted as a party game. Extremely fun, but basically plays like the GBA game through the Game Boy Player without the charming cutscenes from it. This is by no means a replacement for the GBA game - even if you're playing that game on TV - but rather a different direction with the same microgames mixed in. Really, really fun as a multiplayer game.
a sleeper hit party game on the gamecube. It's basically a home console port of the first GBA game in terms of single player content, but in multiplayer theres a TON of wacky games that you can play with friends and they are all very fun. Listen to the doctor is my personal favorite out of the multiplayer games, even if it is absolutely unbalanced as hell. The balloon game and outta my way are fun too and there are even a few more involved games like the E card game and the spaceship one. This game definitely stands up there with the mario party games and Pac-Man Vs. as one of the best party games on the gamecube.