I've been playing my xbox one since it arrived over the weekend, mostly just playing Assassin's Creed. It's quiet, which is great. I don't have any problems with the blue ray player so I'm one of the lucky ones it seems. Still, from what I'm reading Microsoft is handling the problems pretty well by giving you a free game, letting you keep the broken console (unlike Sony) or return it later, and sending out a new one asap. The controller ate the batteries that came with it within two days so I decided to go grab one of the recharge kits and have a cord connected to it just like how I did for the 360 but the cord is so much thinner, which is nice and it's pretty long. That allowed me to put it into one of the back USB's, which there are three on the One.
The voice commands are great, turning on your TV, the console, connect, and the cable box/other receivers (if you hooked them up). Ma got one also for herself since she's loving the idea of just having everything connected without worrying about trying to get all the remotes to work like she's been doing until now. The wireless signal is pretty good as well since it's picking up the router from two floors away since this house is a split level and ma's is up in her bedroom.
All in all, I have no complaints really for anything the xbox one does. It's a great system, as far as I'm concerned, and has a lot better features than the 360 did, especially with how much kinect seems to work better. You can also turn the camera off through system options, or if you're that paranoid, just unplug it after updating the first time.