Nintendo's video game console known as Wii (pronounced "we") is one of three systems (others include Sony's PLAYSTATION 3 and Microsoft's Xbox 360) released into the seventh generation era of gaming consoles.
Wii is solely distinguished by it's motion sensitivity and unique controller, Wii Remote, that took the shape of a television remote. Nintendo markets these features as the true path of revolutionizing video games although they have yet to deliver a game that effectively uses Wii's unique controls. The addition of motion-sensitivity has already been linked to worsening many released games.
Due to Nintendo's investment into the Wii Remote and its motion-sensitivity, they have also gambled with Wii's fate. A video game consoles features can only go so far with first-party (Nintendo) support, which will inevitably happen. The real question is whether third-party (non-Nintendo) publishers will risk developing games specifically for the Wii and not other systems in order to ensure the Wii Remote operates positively. Convincing third-party publishers not to maximize profits by developing a multi-platform game but rather only around the Wii and it's motion-sensitivity is Nintendo's true obstacle. By no means will this necessarily work out for the better of Wii. If this does not happen, Nintendo's investment for the Wii will 180 into a featureless system since they have sacrificed system power for a cheaper system packaged with "different controls".
Please note that Nintendo has attempted and failed here in years past. R.O.B. (Robotic Operating Buddy), Power Glove, Super Scope 6 and the Virtual Boy were all flops with the same selling points as the Wii and its Television Remote.
One immediate disadvantage for the Nintendo Wii is its video game line up. As of this definition posting there are a very small amount of games lined up for release on Wii. Of this small amount half are "virtual console" games. Virtual Console games are old 8 and 16 bit era games you can download to your Wii for the same price you can go to Goodwill and pick up an old console and box of cartridges. This is if you don't already own the cartridges or the entire 8 & 16 bit era of video games downloaded for free via roms and emulators.
In most recent news lawsuits over physical damage to property and users of Wii have exploded all over North America within weeks of the systems launch. Even a lawsuit over the controllers design has sprung up. It may prove Nintendo focused too much time into marketing that they couldn't even realize how easy it is to be sued in the United States.
Nintendo continues to appeal to young children and those that once were young NES/SNES gamers that grew up but missed out on developing necessary adult skills.
Thinking in short term you may want the Wii after seeing its price tag. $250 may be misleading and in long term ultimately a waste. An investment elsewhere is advisable.