Not even close...
I have to agree with the original poster. Well, actually I like the game well enough but it's like Baldur's Gate not like D&D. I understand that a computer game can't replace real rpg but the single-player game doesn't seem significantly more like role-playing than BG or it's ilk. In fact, something like Morrowind seems more like the feel of D&D to me.
For example, you can walk into a boss monster room, fight some, walk out, camp in the hallway next to his door for 8 hours and then step back in and fight some more, rinse and repeat. And I'm talking about supposedly intelligent, mobile villians.
Gaurds continue to gaurd castles even after everyone inside has been dead for weeks. Almost every "enemy" is fanatical--low level mage sycophants charge heavily armed fighters with abandon. Interior logic isn't very prevalent.
Another example, plots that you can see a mile away but can't really effect because they are part of the big story. For example, early on you may figure that someone may be a traitor to the city but you can't really act on it in a meaningful way. (Actually, I didn't try _all_ the ways you could attempt to act on it but from what I saw the plot was going to move inexorably on).
Creative play is limited. Your thieves can't climb walls to get info so they can start a rumor-smear campaign against their enemies. You can't knock people out and interrogate them or disguise yourself as someone else. You get a quest and you do X to get to Y to get to Z, here are some experience and treasure. You can't create magic items or swing from chandeliers. The world doesn't seem dynamic. You may find a fork in the road here or there but the roads come back together pretty quickly and you certainly can't step off the road and just wander the fields.
Now, admittedly I haven't finished the game but this is my impression so far (I'm about to start chapter 3). Maybe lots of possibilities open up later but if so why aren't they available early on?
--vox