After reading up a bit, I tried to see how I'd fare at controlling the Xbox One with voice commands. Above, you'll find a video of me trying out various system commands for about five minutes. As you'll see, it works fairly well, though it does get hung up in places.
Now that I've spent more time using Xbox One's voice commands, I've learned that the system is teaching you more than you're teaching it. A voice training app helps out a bit, but what really bumps up the success rate is brushing up on the commands and when they can be used.
Even with my improved success rate, there are still times when Xbox One refuses to act on a command. Of course, success rate is at 100 percent with the controller.
Curiously, while playing back this video, Kinect heard and acted on some of the commands that it didn't the first time. Yeah, I don't know either.