I just entered Act 3, about 60 hours in for me. So far, no crazy bugs. I have had a handful of out of place dialogues where someone will say something that maybe didn't happen or has not happened yet but these are your camp conversations I am talking about and not that big of a deal. Having played EA I was expecting more bugs and/or a more bare bones story/world when it came to Act 2 and beyond, the content that was not play tested by millions for 3 years. I am happy to say that this just isn't the case.
I have seen a few rules bugs and had a character roll around with a ! over his head for a while, which means he has something to talk about with you, even though he didn't have anything new to talk about it.
I am running it on a 4070ti @4k 60fps and it has never dipped below 60 that I have noticed. That said, I have heard that Act 3 has some frame rate killing environments. I have had exactly 1 crash. Technically the game is in a much better state than DOS/DOS2 were at release.