Act 1 is the holy grail of all gaming experiences, Act 2 is very thematically tight and polished even if it's not quite as content-rich, and Act 3 doesn't feel quite finished. It was something I was hoping a definitive edition would fix, and I'm not so hopeful for that now. I can live without DLC, but leaving the climax of the game the way it is, give or take some bugfixes, makes me sad.
I agree completely, still holding out for a definitive edition that addresses some of the issues with Act 3.