For instance, Metro lacks a file chooser where you can easily find files anywhere in your system. If the Metro interface had a good file chooser, you wouldn't have to drop out to use the file desktop chooser to find a file on any filesystem.
If Windows 8.1 adds a good file chooser and if Microsoft addresses a few specific problems like that, life in Metro could get much better.
I hope Microsoft can get its branding straight -- I find it weird that I click on a music file across the network and it pops up in a pretty Metro app with the tag line "Xbox Music". There's also some thing (which has never quite worked for me) called "Xbox Games" which I'm not sure will do anything for me if I don't own an Xbox.
Or is everything that runs Windows 8 an "Xbox" of some kind? And how come I see tiles for all kinds of music except for the music that I've got in my own collection?