Are you not so big a fan of the UI in the Xbox One? Personally, I find it functional, but not visually appealing. Sure, the point of this UI is to give me access to everything quickly, but adding a little more eye candy, especially with such a powerful machine (coughs) couldn't possibly hurt, nay?
Here's a fan-made "ultimate" Xbox One UI. It is really good. It is so good, Microsoft representative Major Nelson was impressed by it. Here, have a look: