Actually this is what I really liked about DA2. I take role playing the same way, I am playing a character in a story, trying to decide what they would do and what they wouldn't. And in DA2 I felt like I had an incredible amount of fidelity when it came to making my character behave the way I thought they would behave. It was crazy the number of times I was like, "I would do this if I could" but then, well, I could. I think a good indication is that, at the end of the game, most of my party betrayed me, ran away, or died and I was left with, I think, three friends. From a gameplay point of view not the best ending. I loved it though, because all throughout I had been playing a kind of unlucky hero who tries to do the right thing, but always ends up sacrificing too much. And thats exactly what happened...
P.S. I also had a great time talking about what happened with friends. The three of us played very differently and things turned out very different for all of us. I mean, the broad strokes were the same, but who we talked to, what they said, what quests we went on, were all very much unique.