because moving a controller down to kneel or up to get up is a whole lot harder to grasp then hitting a couple of buttons. I think you miss the point of the rev controller.
i'm pretty sure if you took 2 non-gamers and put them in a room with the rev controller and a more traditional controller, they would more easily grasp and remember that a movement left = roll left rather then hitting L1 or L2. + they probably won't have to look down at the controller to see if they are hitting the correct buttons either.