You mean the revelation about Gosling not being Deckard/Rachael's son and instead that woman in the box being the daughter? That was good. It means he wasn't special. So he tried to be by saving Deckard and dying all heroically.
It's definitely not as good as "Sicario," but I'd probably put it on par with "Prisoners." I hated "Dune" and don't really remember "Arrival," tbh, which isn't a good sign. Have to see that earlier one.