Well, first of all you have to think in general. Black Isle couldn't do anything good due to Interplay's situation. So don't blame them for bad games. Because they proved they are the best in this domain ... with games like Planescape Torment, Fallout Series or Icewind Dale Series. Right? About Obsidian, I think they left because they wanted more freedom, to create nice good games :D
And if they're making Star Wars KOTOR II I am sure it will be a good game, because from what I've seen they have BIOWARE's support. About SW KOTOR I, you have to say it was awsome, I think it was the first after Planescape Torment that had an attractive story ... that gave you that feeling to play it 24h/day.