WarioWare: Smooth Moves is a great game if you have a lot of friends that like to play games with you.
The game has often been criticized for being a short game. Most people do not realize that even though the "ending" credits have rolled across your screen, the game is far from over. After this point, you have unlocked the multiplayer mode, where this game really kicks off. You can also go back on each level, and continue to unlock brand-new mini games to play in the future.
The multiplayer is a huge draw to this game as most people will have some good laughs with their friends. It's great that you only need one Wiimote as well, considering they are still scarce, so it's an easy way to have some good multiplayer fun if you only have one controller. The negative side to it is that most people buy this game with intentions of playing multiplayer, but you have to unlock it first, it's too bad, but doesn't take overly long to complete the initial story mode.
The visuals in this game are nothing special. They do offer a pretty clean look, but nothing mind blowing. To be fair, they aren't meant to look real, most are very simple, which complements the gameplay quite well. The one level which features past Nintendo games is pretty cool to see, although it has been done in other versions. It is just really fun yanking the Master Sword from the Pedestal of Time, oh how I love thee motion sensing.
For all of the many multiplayer games released on the Wii in this point in time, WarioWare is the best. It makes excellent use of the Wii's motion sensing capabilities and offers simple, quick gameplay, which is great for a multiplayer game. This game probably shouldn't be purchased, unless you frequently have people over to play games, otherwise you might as well save some money and just rent it, this goes for most multiplayer games to be fair.