...is if they improve the storytelling. And create characters that the player actually gives a crap about. I don't know about you, but I didn't care about anyone in Oblivion and never bothered to finish the main quest because well... the pacing was somewhat poor and I sometimes didn't know what I was doing. I honestly had more fun with the guild quests than I did with the main quests.
Naturally, since Skyrim (like any other TES game), will never force the player to relinquish control of his or her character and force them to watch cutscenes. But, I think that Bethesda should perhaps make the world a little more dynamic, allow the player's actions to resonate through the world, and deliver better story-telling that way.
Thoughts?