As I mentioned I'm aware that its a preview/beta and images, etc. will somewhat be placeholders and so on but as most of the UI visual updates (and why spend dev time on UI updates when the placeholder will do - replacing ropey icons/controls/images with new ropey icons/controls/images just raises questions) have been steps backwards rather than forward and its fairly close to Windows 8 I don't expect miracles come release - the recycle bin was just one of many things I was highlighting in that image including the overall layout and usability.
End of the day the UI is what you have to deal with so if its clunky or awkward to use it doesn't matter how excellent the underlying code is and people don't generally by choice use an ugly UI over one that looks a bit more pleasing on the eyes.
There may be some areas with good engineering but there are a lot of areas that show some really bad coding and design work - literally someone in college messing about with visual basic could do a better job of the start menu and I can't count the number of bugs with it i.e. buttons not updating or not responding, sorting/sizes randomly resetting or doing their own thing, right click menu items sometimes disappearing or appearing as double or even triple entries and so on.
(I have spent many many hours doing UI programming and/or design over many systems from low level stuff in DOS, games, windows applications through to webmin, etc. so I know a bit about what I'm talking about and I know poor standard of work when I see it.)