Nofsinger also got a bit more technical, adding that High Voltage hoped MotionPlus "would allow for better off screen IR tracking." Instead, Nofsinger says the device "seems to lend itself more naturally for hand to hand combat" and that it "doesn't feel like an optimal fit for how we had designed our moment to moment gameplay." Well, that explains it.
Sure, we want as many features as we can get our hands on in a game, but if it doesn't improve on the experience and just feels tacked on for the sake of being a bullet point on the back of a box, it's not worth it. It looks like High Voltage agrees.