I stopped my initial playthrough at the beginning of Act 3, after reading that it wasn't considered complete. I'm now playing through my Tactician run and have begun Act 2. I've already seen improvements from my first run-through. Between my miss-nothing Tactician run mixed with some Starfield I figure Act 3 will be nice and fleshed out when I'm ready to hit it.
Is this optimal? Hell no. But this amazing game gets a pass from me. I don't want to finish it without the same wonder and joy that I had playing through the incredible first 2 acts. I can wait.
If YOU can't wait, then stop playing. Put on your big boy pants and stop crying and go away and play something else. It's pretty simple.