Although, I honestly don't see what's wrong with the UI.
Ahm ... just to name a few points:
1. Worst design ever. Doesn't fit the genre/game.
2. Bad overview on items, no option to sort (also quest-items should get an extra cathegorie)
3. Button-assignment not optimal
For example it would have been better to put stuff IN a container with the same button you take single items OUT of it. The way it's done now, this often happens:
- I accidently eat a potion/ingredient instead of putting it in a container.
- I accidently take EVERYTHING out of a container, after sorting items for 5 minutes, when I only wanted to take out ONE item I accidently stored.
4. No character view, no real view on faction-status, XP, etc.
5. 3D-map would be cool in a science fiction game, but not in a fantasy RPG like Skyrim. Also you can't zoom out far enough, and everything is just white on white (you don't even see streets).
6. Unnecessaryly complicated navigation. Always have to go in an out of cathegories, instead of being able to just switch between them. Same goes for the interface in whole with this "compass", where you have to chose, if you want to access map, magic, items, perk-trees.
7. etc.
The whole UI is a desaster.
It's bad on so many levels, that it's almost unreal to see something like that in a game of 2011.