Do you want a quick hit on why the menus are terrible? OK.
1. Random detection zones for mouse-clicks. If I get the wrong PIXEL, the menu closes. Instantly.
2. Lack of a "back", so I need to enter the menu multiple times to, say, change my weapon AND my dragon shout.
3. Inconsistancy. They don't all function equally. Sometimes, the mouse is useless. Other times, the keyboard is either stupid broken, or less-than-functional.
4. Dialogue menu often selects something other than what I selected.
5. Perk navigation is bad with the mouse, and worse with the keyboard.
6. Why is my Journal over in my "system" menu, rather than with my character-related stuff?
7. Active magic effects are buried far deeper than they need to be.
8. Abyssmal usage of screen space.
9. The font. It's too freaking futuristic for MASS EFFECT. Let alone TES.
10. I'd prefer to use command-line UNIX to Skyrim's UI.
1.) I have never experienced this. I'm not sure what the issue is.
2.) No you don't. You can use WSAD to navigate from one section of the menu to others without having to close the menu.
3.) Again, I have never experienced this. I'm not sure what the issue is.
4.) I have never had it select the wrong dialogue option, but I do know at times it can be slightly unresponsive.
5.) It is actually very simple and easy with a mouse and keyboard.
6.) This is how it was in Oblivion as well. In Oblivion, you would hit B or Tab to go to your Inventory / Magic menu, and there was another button / menu for journals, maps, and character information.
7.) I agree, but once I found out where they were, it was no hassle.
8.) 100% disagreed.
9.) I greatly enjoy the font. Just because it's not some old English font doesn't mean it doesn't fit.
10.) I don't even know the reference. I find Skyrim's UI to be one of the easiest to navigate, slickest, more aesthetically pleasing UI's I've encountered. Greatly enjoy Skyrim's UI.