Another criticism is that up to now at least the story has nothing to do with the events of the BG games at all.
I really, really, really don't want it to have much to do beyond "Oh yeah, baldur's gate 2 happened before this". The bhaalspawn's story is done, dusted, and the more they reference it the more likely something will conflict with a player's experience of the game. Keep the themes of power/corruption? Sure, but nothing more, please.