This just seems like the typical complaints about UIs because people can't be bothered to hit a couple of buttons quickly. People just can't be bothered to take an extra second to get to what they are looking for. That just seems lazy that you can't spend 2 seconds of your time getting to your item and you'd rather the dev team spends an extra month or two so that it can save you a sec. That's incredibly selfish. People need to learn that having your entire UI on one screen and being able to find what you want quickly is infeasible. It's faster to have organized tabs like in Oblivion than it is to have a full screen inventory like in Morrowind.
That's a somewhat unfair representation of the criticism. It's risible to say that people who complain about an interface's inelegant design are "lazy" - after all, what is the job of the UI in a game like this if not to present useful information to the player in a clear and efficient manner? And there are reasons to think that Skyrim's UI won't be doing this as good as it should be (and, FWIW, although I think we're just pulling numbers out of our arses, I doubt that it would take "an extra month or two" to make the few little tweaks that would make a big difference).
Anyway, I think one significant benefit to the UI could be had if
the player was allowed to customise the order of the skill list. Having only seven skills displayed fully at one time, along with their value and their progress, is not such a big deal to my mind,
provided that you can display the seven skills you want. Otherwise, if you're playing a character specialising in, say, One-Handed, Archery, and Alteration, you might need to scroll around a few times to get the information you want. But if you could put your preferred skills together in the skill list, then you could just open up the skill menu and take in the information you want with a quick glance.
As for the horizontal list (as opposed to vertical), I don't mind this so much, even in light of Ghastley's point earlier. I do agree, that stacking the skill progress bars on top of each other makes it easier to compare the progress of a bunch. But only if you want to make more fine-grained judgements of which of a set of skills is closest to increasing. And generally that's not so important. One generally does not need to know that Destruction has made 52% progress to the next level, while Alteration has made 50%. It's usually enough to be able to tell that Destruction has made 52% progress to the next level, and Conjuration has made 40%. And there's no problem with being able to make those sorts of judgements reliably with a horizontal list.
As for the inventory, I thought Oblivion did a reasonably good job - it was just that the icons were way too big for PC. Tabbed/filtered browsing is certainly a necessity. I hope that what Skyrim does here is something like iPhoto (for instance, just to follow the Apple theme). So suppose you were browsing weapons. Then there would be a horizontal list of icons up the top (or the bottom) of the screen, and when you select one of them (by scrolling to make it in the center of the list), the selected item is shown in full-size below the list, in the middle of the screen. Something like http://emiratesmac.files.wordpress.com/2006/02/iphoto%20fullscreen.png is what I have in mind.