200 minigames is a heck of a lot for a GBA cart, but it would be nice if the game's presentation got the same attention.
Well, sort of.
The plot starts off with what is the plot of every other Nintendo game for the Game Boy Advance (Mario vs. Donkey, for one): the character, Wario in this case, watches a TV commercial and has a Eureka moment in which they plot to get super rich. However, Wario isn't one of the world's greatest thinkers, so he calls his friends to help him achieve profit. That's as far as the plot goes. Then you play minigames. Lots and lots of minigames.
The game is enjoyable enough this way, and the minigames are great, especially 9-Volt's collection, which are snippets from old Nintendo games. The minigames last 6 seconds at the most, and after making it through a certain amount of minigames, you take it to the next level. Replaying a finished level lets you go on on that level forever. The difficulty increases and you get a 1-up every now and again. You can practise a single minigame over and over again in the Grid section.
So much for the good part. In the end, the biggest thing to complain about in WarioWare, Inc. is the outright terrible presentation. It seems that Nintendo swore during development that they would NOT put more than 3 frames into a single animation, and they have accomplished this feat wonderfully. The graphics, even for Game Boy Advance graphics, fall somewhere between crude and downright abysmal. Half the minigames you'll be playing in black and white, and the only minigames with graphics that don't sting the eyes have barely any animation. You can count the 'blocks' each sprite is made of. Nintendo also chose to use this game to shamelessly advertise their products. There is almost no sound except for the dude whose minigames you are playing either grunting or saying, "Yeah! Come on!" when you lose or win respectively.
Besides it's numerous shortcomings, WarioWare Inc. is addictive in a bad way, and can provide several hours of a mixture of enjoyment and frustration.