I'm actually a huge fan of Metro in it's current form, especially the Windows Phone incarnation of it. Outlook.com, Office, and Windows 8 have applied Metro differently, but my favorite is still the Windows Phone implementation. The animations, panoramas, the pitch black background that surfaces your content, they all look beautiful, they contribute towards the user experience, and everything...just makes sense.
Zune was great, I don't know why people make fun of it, it had such a great UI that was ahead of its time with a great service that was also ahead of its time. Zune didn't have to die at all. Alas, Microsoft was in a saturated market filled with consumer apathy that bought into iPod+iTunes.
The current state of Xbox Music is pretty pathetic. The stupid thing is that Xbox Music is only available on Windows 8 and Windows Phone 8. Yeah, that is not going to help get the service anywhere further than Zune did. If Microsoft was serious about competing, they would release a app for Windows 7, iOS and Android, take on Spotify, iTunes, and Google Music head-on. Seriously. Microsoft needs to wake up their idea here.