Well, I think I'll chime in here. In general, I don't have any real problems with the default UI organization. My main concern/problem with the default UI is that they try to cram just a bit too much in each screen. By this I mean that there are:
1. Too many functions/options/choices on each screen.
Only the basic functions required to do the primary task should be presented to the user on the default screen. Everything else should be available in a separate advanced options or configuration menu. Basically, if a function isn't used at least once in every few visits to the screen, then it shouldn't be there.
2. Too much either unclearly presented or unnecessary information displayed at once.
I'm not against having lots of information available, but but it needs to be presented in a way that is clear and obvious at first glance.
Icons (such as first run, HD, etc.) should be different enough in design that they can be clearly differentiated instantly. Further, the design should be such that the meaning of the icon is also easily understood by a first time observer without having to consult the manual.
Key media information should be available on the screen, however secondary information should be out of the way.
3. The number of borders and lines throughout the UI has greatly improved since v2, but there are still some places where this turns up, such as in the video OSD.
Extra lines and the such just add to the feeling of clutter. Again this area has improved greatly.
The core animations have gone a long way to making the UI easer to follow and use (plus they add that slickness factor). Add to that a little more polish on the default graphics to make them a bit 'shinier' with a bit more contrast and maybe some icons to give a bit more splash to the main menu and there you have it.
My impression of the default UI is that it is cluttered and it always seems a bit harder than it should be to do the basics, mostly because I have to sort through so much to find the function I want. I might be a bit off base here since I hardly use the default UI at all, but I think the principles I mentioned should be valid anyway.
That's really about it. Basically, less is more. Each screen should be kept clean, simple and on purpose. Anything that doesn't need to be there shouldn't be.
Well, that's all I've got. Thanks for reading.
Aloha,
Mike