The only UI issues I found (the rest of the UI is fine for me) is that when you rebind keys it will affect things associated with those keys that aren't bindable.
Such as: When you rebind F for a different shortcut (such as making it sneak) in turn it will also unbind the ability to create a favorite in your inventory.
Other than that it's fine...just takes getting used to. It does have a bit of consoleitus though.
Forgot to post this:
Basically. What Bethesda lacks on putting in is customization for elements other than binding just because how even two PCs can be vastly different.
It doesn't quite matter to me though. "Old" RPGs I played were usually mainly mouse or joystick derived and even now I dislike the keyboard and like to use a 360 controller.
Hook it up to my HDTV. Suddenly I have everything console users do and then some more with better performance, marginally better graphics(Remember better graphics depends on the PC. I poured thousands into my rig and fine tuned it.), and even more.