The technology is a small part, the development is a large part. You need the software to make it engaging. And as shown on the Wii so far, most developers have no idea what to do with it. Nintendo used it exceptionally well in many of their games, as is to be expected from first party, but there were a lot of games with bad controls. The Conduit, though, was a good exception to that statement. My point is that no matter how advanced the technology is, developers need to learn to use it well. And sony and microsoft are late to the game on motion controls, and thus don't have enough experience to put out good games right away.