Metro goes back to Windows XP Media Center, and frankly was one of the best UIs ever. Also used by the very underappreciated Zune (which was not helped by its drab hardware design or MS's PlayForSureWeMeanItThisTime DRM)

I had a $99 Windows tablet that I thought was a great value and totally easy to use, but, like every other tablet I've had, I mostly used it to browse the web. Zune was pretty good but the only program that deserves the name "It plays for sure" is VLC.