I didn't think it would be all that great. Boy, was I wrong!
The storyline of WarioWare (yes, there's a storyline) is how Wario is on a get-rich-quick scheme by using his friends to help him make the ultimate game. (This game is more or less the game you'll be playing.) He calls up each of his friends to help them, and the game shows each of them on a small adventure in which to get them somewhere in their daily lives. It really is a little vague on how everything fits in, but once you start playing, it really doesn't matter all that much, as the gameplay will make up for anything you're missing out on. And even so, as you go on to play the game, you'll find that the storyline works just as well anyway.
The way you play the game is that you select a stage (which each of Wario's friends make up) which has it's own set of microgames. Each stage shows that character doing something in their daily lives, and as they do this performance, you will be presented with a microgame to complete. Each of these microgames gives you a matter of seconds to perform the right action. If you do it right, the screen will switch back to your character and they will do whatever it is that they are doing right. If you fail the game, then you will lose a life and the character will mess up somehow. Basically it's a classic hit or miss arcade game. Given the speed that the game goes by, those four lives should prove to be more than enough.
At the end of each stage, there is a "boss stage". Rather than taking a matter of seconds to complete, these ones take quite a bit long and put you through a longer series of actions. If you win, then the stage is complete.
After you complete each stage the first time, you can go back and repeat them. This time around, however, the game does not end until you lose all your lives, so the point is to try and get a high score of how many microgames you can complete. This becomes difficult, as after each 10 levels, the speed of the games will increase. I especially liked this feature of the game. I actually spent a couple of months AFTER I finished the game replaying these to try to up my score. It became an addiction in time.
Finally, by completing certain conditions with the different levels and stages of each character's games, you will be awarded with a collection of minigames, which, unlike the main game, are actual games. While these games are fun to play a couple times, they do tend to get a bit too repetitive, however. They are more or less all classic shooting games of some sort, that simply increase in speed and generally not changing all that much. Don't get me wrong, I had a great time beating the default high-score in the Cowboy shooting game, but these minigames really couldn't be played more than a couple times in a row.
Overall, this is a very fun game to play. Surprisingly, the game itself never gets old and it can be picked up and played over and over and over again. It's a good test of reflexes and is good to train you to be quick thinking. I'd recommend anyone with nimble fingers and a quick mind to play this. You'll really enjoy it.