The thing with Bioware games is that I never felt challenged by the combat in them. Whether Knights of the Old Republic or Mass Effect or Dragon Age or Baldur's Gate, combat was never the central focus of the game. These were, to me, primarily RPG's.
And that was a good thing. It meant that I rarely felt let down or frustrated by the story. It meant that I could feel heroic in combats without needing to practice some esoteric, real-time, combat system that would leave me dead more often than not simply because I didn't press A instead of B at the right time. The story and the character were the focus.
Given how combat-centric the Witcher 2 seems to be, I'm not sure I'd enjoy it. I'm the type that will obsess over excelling in something that challenges me, which I find exhausting and so I tend to choose which challenges I'm willing to be challenged by, very sparingly. In fact, the last time I felt challenged by any video game was with Myth 2.