Most of the bad rap the kinect gets is from the poor game design of many titles released for it....
If Skyrim had kinect functionality, it would best be implemented as an optional way to control certain aspects of the game.
Here's the issue... those two comments don't go together. In order to have the functionality be good (ie., not "poor game design"), it'd need to be central to the basic game. A game needs to be designed from the ground up to incorporate motion controls properly into it's gameplay. Anything else is doomed to be bad or just not meaningful....
If nothing else, controlling the grab function that Oblivion had and Skyrim will almost certain have as well would be awesome - kinect control of that + telekinesis spell? Force unleashed style, haha.
And how would those functions (grab & TK) work without it? If you make TK really great with the Kinect, and make it so that it actually matters (i.e, things to use the awesome TK on that aren't just playing around)... how would you then make it playable without the Kinect? Because you'd have to, since you made TK important enough to bother making a special control scheme for it. (And since it's a multiplatform game, and can't count on having a Kinect to work with.)
(And then there's the flow break of switching between control methods - you're sitting there, tooling around doing things with your controller.... whoops, need to do something with TK - activate "kinect mode" for the TK, put down the controller, stand up, and do your force-pulling. Now sit back down, grab the controller again, and tell the kinect that you're done TK'ing and to stop paying attention to you. Unless there's some better way to have the game recognize that you're only using the kinect input for some actions and not others.)