So I just finished the game after 125 hours. I wouldn't say I'm disapointed but I'm not really satisfied either.

So many things happend in act 1. You had almost constantly new dialogs with your companions. There was always something happening in camp. It felt very immersive, you got to know the characters. I loved it. But as I kept playing and continuing with the story it felt like it became less and less of these kind of interactions. It didn't feel as deep and in act 3 it was basically completely gone. Almost no reactions anymore, no new dialog options other then with jaheira or minsc.

Gale:
Nothing happened with him anymore after he read about the crown in the book store. Why? Such a lose end.

About the ending in general:
My character became a mindflayer and kills herself in the end. There were absolutely no reactions from the companions, only jaheira "stop it" and that was it. Like why? We have been together through so much and no one cares? No final goodbyes or whatever?

All the characters had no depth in act 3 compared to act 1. To me that's what killed my fun for playing the game a bit sadly. In act 1 I couldn't stop playing, always wanting to know what happens next. Act 3 felt more like just get it done to see how the story ends.