I think Larian had good writing until they brought in other writers and started reworking their ideas. I agree with you, but for me this game is dying more and more, after every interview with Larian, when they say - "everything is great in the game"
And it's a little sad that we'll never know what would have happened to the story if the original writers had done the whole game.
Most of Astarion was written by the same guy, but then someone else started "helping" and you can really tell when things start feeling like a bad fanfic.
If a character's "good" path feels worse than their "evil" path I think it's time to take a good look at the writing lol.
