Now imagine playing oblivion for the first time and instead of pressing LT to hold out a shield or just constantly hitting RT (which most people would do in the beginning) you actually were capable of acting realistically. If they charged at you swinging a sword how fun would it be to actually be able to step back put your left arm up (as if you were holding a shield) and then swing the sword which is mapped to your right hand at the defenseless person that is still trying to regain stability after swinging a sword into another metal object. The kinect is good enough that It can easily capture everything you do. It could even capture your mouth opening so that you could actually create that big shockwave shown in the trailer.
Since this sensor system is so good at recreating every motion you do you could actually fight as you would want to in real life. You could choose to block or duck under a sword being swung at you and that would give people a much better indication of they're play style, making it easier to choose from the many different ways to play. I personally can't imagine how much fun it would be if I could reenact the way brad pitt fought in the movie Troy. Jumping to the right of a giant swinging a sword and killing it instantly by stabbing it's heart by shoving the sword through it's week spot at the neck. There isn't any mapping scheme that could give the player the sense of satisfaction that would come from doing something like this, especially because avoiding a giant beast like that would be hard to do constantly and swinging mindlessly at it would in real life just give the thing minor wounds and would knock you off balance long enough for it to make a well aimed hit.
If I am wrong show me how but I just don't understand how amazing it would be to play a game like this and be able to act as I would in real life to each situation. I just feel that any amount of money that it would take to make this possible would be totally reimbursed by the satisfaction people would get when they are able to see an arrow being shot up at them and naturally move their shield in front it to stop it. The first game to do this would again revolutionize the gaming industry and only seems fitting that Bethesda would be the company to do it, especially because this genre is so perfect for motion sensing. (haha that way rockstar could get a better idea of how to create a new form of controversial entertainment by actually allowing someone to grab an NPC in a car and throw them out so they could take it for a spin themselves)