I have to disagree with this. Or at least, say that it is not unique to The Elder Scrolls.
I like the fact that the game is an open-world but our choices are, overall, pretty linear. We do not really have much of a choice on what to do, at least with the main quest. Take Oblivion, for example. What choice did you have other than to help shut the Oblivion gates? None really. Sure you can "do anything" in other areas but how's this any different than any other game?
Red Dead Redemption. In that game I can "do whatever I want to do." I could spend every day playing poker and consider myself a professional poker player. Or go around simply killing people, becoming a wanted criminal. In Grand Theft Auto, same thing. You can do this with pretty much any game. Its nothing unique.
The point of this thread? I simply wish that we were made to make choices that had real, legitimate consequences. Much like how (and I know people hate when this game is used as comparison) New Vegas did. Very well done in that regard. I'd like to see something like this done.
I really hope in Skyrim if you're a member of the Dark Brotherhood you cannot join the Fighter's guild, for example. Or if you are a necromancer you should not be able to join the mages guild. Let's simply have some real consequences so Bethesda's claims can be true.