I did not stop to continue the story in The Witcher 2, felt passionately for its stories. And not only that, there were things I missed because of my choices, that there were some who died because of my choices and all that changed if I played again.. it was something I never experienced in an Elder Scrolls game.
Real consequences, you actually go down a different path and you won't see what's in the other path, so much power is given to the player, and that creates an amazing role playing experience.