We've experienced system hangs at various points of usage multiple times. At least a dozen in the first couple of days of usage, perhaps closer to 20. A few times (very few), the problem seemed to go away after turning the console off and then on again. Most times the only way the system becomes responsive is to disconnect it from the power for a few seconds to a minute. This happened 2-3 times when trying to set up a second profile, at different points in the series of inputs the system simply stopped responding entirely. Ultimately we gave up on a second profile for now. Sometimes, when we go to the Xbox Home page (either via voice or controller input) the home page is frozen once we get there.
We purchased two games initially: (1) Zoo Tycoon; and (2) Just Dance 2014. Zoo Tycoon seems to be working. At least we've not hit any snags with it yet after just a few hours of play. However, Just Dance simply will not load. Sometimes it presents a graphic with the game title, pauses for 10-20 seconds, then returns to the Xbox home page. No error messages or other indications are presented. Yes, the DVD was in the drive. The furthest we've gotten with it was by waiting to put the DVD in the drive until Xbox fully loaded following a "hard" reset. Twice this got us a bit further into loading the game. Once it presented a warning about health considerations, then froze and went back to the home page. The second it got past the health warning and appeared to be loading and/or downloading, but then froze and went back to the home page.
So far our experience with Xbox One has been rather mixed (at best).
Is it possible we have a bad unit? Or is there something we can do or update to improve performance?