Seems fine to me. what's wrong?
It all comes down to personal preference for aesthetics, but I greatly prefer an interface like Metro, which strips away all the beveled edges, glossy buttons, transparency, and random swooshes in favor of placing emphasis on the content. The way that content itself is organized (home, games, music, movies, apps, etc) seems logical and consistent with the 360's dashboard, which is easy to use. My biggest complaint about the current dashboard was the use of ads and relegating customization to a separate section, and both of those have been addressed here.
Alternate color schemes for the tiles, similar to how Windows Phone works, would be nice, but the current color is better than the puke green of the 360.