The main story is too convoluted. Did we really need the Elder Brain and Balduran? It would have been much more satisfying, if it would have been about getting rid of the three Chosen ones. Make Gortash and Orin more important.
As it is, I run out of steam after doing Auntie Ethel and Raphael, because they are my favourite encounters in act 3. I like the Minsc storyline and the underwater heist and after that, I mostly go through the motions. As a Durge, the Bhaal story is interesting, but everything after is just not my cup of tea anymore. Especially the Balduran reveal is too much.

"We are all stories in the end. Just make it a good one."

Doctor Who