Originally Posted by Alrik Fassbauer 
The only "succession" I see is the rules system. Which looks to me like a direct rip-off of (A)D&D.
On the contrary. Being different from AD&D is one of DA's strong point. BG2, and to a lesser extent BG, had good stories and great characters. The game system wasn't so good.
And that's from someone who has been playing D&D since 1976.