It's ok, and heavily inspired by the zune windows app (which had some more interesting UI/precursor to metro): http://cdn.appstorm.net/windows.appstorm.net/files/2011/04/s...

Rdio: http://assets.gearlive.com/blogimages/rdio-white-redesign.jp...

I think a good argument against too much flat design is just how similar things end up looking.