Personal opinion:
He was a huge fan of shingeki since ch. 11 that I started reading the manga before it was broadcast on tv, I considered it one of the best works that had been done in the last 10 or more years, for its realism, for its mysteries, because most things had a justification convincing, that separated him from many works. but the last arc in general seemed to me lacking in emotion and dramatic twists, take for example Levi vs titan beast, the whole attack on Liberio, etc.
Regarding the end, I dislike it to such an extent, that I am not going to recommend anime to anyone, as I had been doing with past seasons, especially to ordinary people who watch anime casually and only if I persistently recommended something they would watch it. .
There are many things that I disliked and that could easily be handled in a better way, I did not care if they died or not, because since I activated the rumble I felt that I could die in many ways. I did not care about the warships, but I did. the story character mattered.
History: eren says that he will not sacrifice history on several occasions, but allows an almost unknown to impregnate history, you can imagine what history had to happen in his life, so that at one point he had to have sex with a person who did not Ama, who barely knows by sight and who in the best of cases have spoken to each other, the look of history when she enters the barn and Eren is behind hooded, she is dead inside, they imagine her while this subject is on top of history moaning and sweaty as she must feel inside, how many times did she have to do it to ensure a pregnancy in such a short time, this is almost consensual rape. This is not perhaps sacrificing history in the worst possible way. The worst thing about this is that there were several ways to avoid this aberration with history.
It could have been hidden when zekke arrived, this would have made the day use zekke for the rumble, not having the queen available, they would have taken him to the forest because they continued to distrust zekke and what we already know would have happened, without having to sacrifice to history.
They could not kill zekke or eren because it would be the end of the day, zekke had the military police in his hands because they drank the wine and it is not known since when they have been drinking it, since zekke's original plan was to activate the Rumble with eren and not with history, there are many ways that zekke will activate the rumble: history refuses to inject itself, zekke threatens the soldiers and high ranking military present with turning them into his delivery of the titan beast.
Even if she ate zekke, as in the end the curse of the titans disappears, she would not die in 13 years, although I doubt she could eat him due to the fact that zeke had been devising any plan to get in contact with eren and avoid being eaten .
There are so many ways to prevent history from having to go through this, imagine if mikasa, hange, annie etc. They would have had to go through this, they imagine their sister or mother, that is why for me isayama destroyed history, that with only 19 years old she had to feel the breath of this stranger on her head almost every day in order to get pregnant, how he was inside while this was happening and how they were his best friend and the person he trusted the most, after ymir, he let this happen. They all suffered a lot, but history did not deserve to go through this, if so much Isayama needed to get her pregnant just to create controversy on her sleeve, she would have preferred it to be eren, Levi, jean etc. people she trusts and appreciates are the father. We had had so few history panels after the timeskip, despite the fact that she had had a whole arch before, which was the queen of the walls, that in the panels where it appears I wanted to think that those panels were important and she had some plot important within the outcome of the story, but it was not, they wasted her character, they made her go through something that no woman should go through, I would have preferred that she just hide and reign the day after the rumbling, and an eren that I advise you to hide when it arrives zekke, to protect her. and not what we got, full of panels that seemed to show one thing that indicated that the son of history would have more importance as a possible reincarnation of ymir, and so many theories that had appeared on the internet, many of which were better than what we god isayama.
If I had to talk about the other characters I would have to write for hours, but I'm sure many of you will take care of the most important characters and how disappointed you are with how I ended this, I just wanted to talk about the character that mattered the most to me.
Postscript: I think isayama had another ending in mind when she drew the last page of the manga years ago, but something happened that she decided to change it because of this aberration that we have today.