You're a an automatic believer, I'm a doubting Thomas, that's all there is to it.
So far, after years with Wii on the market, few titles have exploited it despite a huge install base. So far Kinect has 1 good title - Dance Central - and a smattering of decent titles. None of them really feel that different from Wii in pricinple - even Dance Central TBH.
We've seen some clever mods using Kinect on PC - but nothing I've seen indicates that we're going to see developers suddenly make Kinect the best way to play an FPS (and by FPS I mean combat focused like Halo or CoD, not a slower hybrid title like say Fallout 3).
If they do, I'll use it, but I'm doubtful at this point. Just the loss of rumble for a game that primarily involves shooting something with recoil is a huge negative for Kinect vs a gamepad or Wiimote for example, never mind reliably coming up with a deep enough control scheme to handle straffing, reload, accurate, variable movement in a 3D environment, etc.
So you believe - I certainly have no issue with that nor with Kinect in general - but I will continue to doubt until proven otherwise.