*Ding Ding Ding* We have a Winner Folks!
And not only are the the market leader by far, in number of consoles. They are also the market leader in profit from the gaming division. Unlike MS and Sony, Nintendo doesn't sell anything at a loss, so they make money on everything that goes on the market. So they don't have to sell 30-40 games to someone before they make back the money they lost on the hardware they sold you.
As for the games, unfortunately, the third party studio's have only just started to "get it" when it comes to the Wii, in that they can't just port over the games they make for the other consoles and "wii-ify" them by tossing in some random waggle the remote to do something. But that isn't the Wii's fault that those studio's can't be bothered to do it right. Most of Nintendo's own content uses incredibly accurate and fine-tuned controls. It is that level of control that makes the Wii so enjoyable.
And yes, Sony and MS are very late to the party called motion controls. That is one of the things that makes Nintendo, Nintendo. They actually innovate on the game experience, which is what this is all about. You can put a faster, flashier, whatever for the video and audio output, but when all is said and done, you are still playing the same games the same way you did 10 years ago (which is probably why the major game studio's love that, since they don't need to change anything or take risks with the unknown. All they have to do is have their graphic art at a higher resolution and use some of the extra/new lighting/pixel effects and they can make the same game they made last year and release it again).