If you don't already own a console, Yes. The Wii might be the least powerful of the three current generation consoles, but it has a lot going for it. Along with being the current home to Nintendo classic franchises Mario, The Legend of Zelda, and Metroid, the Wii has a surprising number of quality third party titles as well. Plus, with low power comes low financial responsibility,
Thing is, those motion controls are no longer all that unique. The Xbox 360's Kinect and Sony's PlayStation Move have both launched. Both platforms are still early in their launch catalogs, but if the visual strength and core gaming appeal of those two consoles are more your speed, you should consider how much Nintendo's exclusive properties and motion gaming matter to you.