sony has had a (superior) motion-sensing controller from day one
what makes it superior?
besides, it's really not very hard at all to add it to a system's functionality even if you didn't put all your eggs in one basket by building your entire system and gameplay experience around the concept.
it actually
will be somewhat difficult to add. not that it can't be done, or anything. but with wii and ps3, the feature is built in. in microsoft's case, not only will they have to ask their audience to buy a mandatory new controller (which cuts potential market by a huge fraction) but they'll have to ask developers to create for it (cuts devs for it)
in this regard, it has more of the "gimmick" type of negatives associated with it.
