Yes, the game doesn't end very well at all. The whole main story almost crashes and burns near the end with underwhelming twists, awkwardly shoehorned in and unfitting C&C, a major character assassination and a final battle that feels far less climactic and tense than the one you just came from. It's only saved by the fact that the characters are still very likeable and you feel for them. But even that can get messed up by CDPR's highly dubious design of how your choices affects the endings. I don't like it at all, and I feel for people who essentially got suckered into an unsatisfying ending through no real fault of their own. I got lucky that I didn't.
Fortunately, the DLCs' main stories stay more consistently strong throughout, especially Hearts of Stone. I have the impression that CDPR probably ran out of time to flesh out the main story last act more, just like they were apparently planning a whole Act 4 for Witcher 2 but had to cut that too. Real shame, even though these games are probably still the best RPG series of the generation and TW3 my favorite game of all time.
Let him be king over charred bones and cooked meat. Let him be the king of ashes