The fatal flaw of Kinect games is that they are built on a foundation of lies.
You are the controller -- except most games control much of the action themselves to make up for the lack of input. It's more immersive -- except the waving of your arms at nothing just makes you feel incredibly self-conscious and alienated. It's intuitive -- except the lack of tactile feedback and inherent imprecision of the input makes it far more unwieldy than button-based games. It's always better with Kinect -- except it never, ever is.
What happens when you combine the Kinect's inherent aura of lies with Lionhead Studios, a company famous for not exactly "agreeing" with reality? First of all, you get told that Fable: The Journey is not "on-rails."