....all the hatred for Kinect.
In my case, it comes from owning one for my 360.
First, the requirements for a space to use it fully are absurd. I do not have a tiny living room, but the way it's laid out, I can't use the amount of floor space that Kinect games "want" me to. The optimum viewing distance from my TV is taken up by a couch and an easy chair, and there's an actual wall right behind them.
Second, Microsoft got so excited about using the Kinect for non-game purposes that they virtually destroyed other modes of interaction. The home screen and tabs and so on for the 360 are now so optimized for the Kinect that they're more awkward to navigate with a standard controller. Sure, the "home" UI started to degrade back when the "NXE" was introduced, but the newer tile-based scheme is even more terrible. (In particular, navigating lists now involves list items that are very large so they're easy to "hit" with the Kinect, which ends up meaning far fewer items per "page".)
(Basically, the Kinect did to the XB360 for controller users what touch screens did to Windows 8 for keyboard-and-mouse users, if you follow my meaning.)
The Kinect is still physically attached to my 360, but it's turned off almost all the time now. The only time it's turned on is when my nephew comes over and wants to play "Kinectimals" (the only Kinect-based game I use that I think is actually improved by the peripheral -- I might add "Dance Central" to that, but that game is too impacted by the floor space requirements discussed above, so it's impractical for me to play).
All that said, I'd still have considered the XB1, Kinect and all, if it had come with solid backwards compatibility. But it didn't, and so I have absolutely no investment that the XB1 could leverage. Starting from a clean slate, the Kinect is, for me, a huge strike against the XB1, based on my extended experience of actually having used the original version.