Okay, no offense, but you have some strange priorities. Why start with speak with dead and animals, features that cost you nothing. There's too many potions and the spell is a freebie.

Then, you seem to have missed some very important lore.
For example, the dead three want to kill all the citizens of Bg. They don't care about the elder brain. In fact, a certain undead mocks them because mindflayers lose their souls, therefore making the plan shit. (It's also a netherbrain, was it? Not a mere illithid random brain. That's seemingly much more powerful)

Sarevok and Viconia actually have a canon ending. Therefore your choices in the last games mean nothing. Larian softened just how bad canon turned out for them.

There's many things wrong with the game, but these points? A discredit to your argument. Everyone and their mom has complaints about insufficient reactivity from Act 2 on. The lack of companion content. The endings that are a throw back to mass effect 3, if not blatant trolling. None of this is controversial