I have my grievances with act 3, but there is a lot, I like, too. I mean House of Hope is great, Ethel is great, the underwater prison quest I like, Jaheiras quest to get Minsc (and having Jaheira as a companion) - stuff like that.
I agree with this, I like those side quests but you either rush like mad to complete those or Mizorra shows up so the problem isn't those side quests it that you can only solve them by being indifferent to the fate of either Wyll's Dad or the capture victim.
And I don't really enjoy losing Wyll's soul ( it's also stupid that you can't say "we'll just wait 6 months thanks, bye")
I had a potion of angelic slumber and a spellcrux amulet so my wizard was able to complete everything nearly everything before Mizorra showed up but I was put in a place of either abandoning immersion or feeling rushed.
The last interview suggested that Larian isn't making a definitive edition - but the game needs one.