The obvious difference being Nintendo did it leading the way when 70m console sales lay before them whereas MS (and Sony to be fair) are doing it to 'keep up' and are facing the fact of having to compete with each other plus the 70m incumbent Wii's for a share of the market.
MS aren't being an inovative disrupter here, they're aiming to go where others have lead - which is fair enough, happens all the time, but let's be real, if Wii hadn't been a success do you still think MS would have invested in Kinect the same way, given it the same priority and risked all on it (something they're no even doing TBH)?
Try to be reasonable... its easier than you think...







