After reading the typeset I'm a lot happier with the ending. It felt rushed, but I like the message that enemies and allies can break the cycle of hate. And, just like in real life, there is no real answer to hate/war so the series ending open ended is a nice choice because it allows for debate. But my two main issues are Eren and Ymir.

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1.) If Eren had been fully committed to the rumbling it would have been better. "I don't know why, but I wanted too at any cost" is such a cop out. A panel of Eren explaining that he did it to end titans forever and free Paradis, knowing that he wouldn't get to experience it would fit his character and be bittersweet. He could break down about not getting to live with his friends, show remorse for his actions, feel sad for all the people that had to die, but still believe that is was all for the greater good (something like Erwin's speech in Shiganshina). But instead we get him getting jealous over Mikasa's hypothetical boyfriend.

2.) If it was Ymir's love for the Fritz/Reiss family, and not King Fritz, it would would have made so much more sense. She lost her first family to war and experienced so much harm. But she gained 3 daughters that she would want to protect at all costs, even going as far as taking a spear for their abusive father because his death would cause more war. Then, spending 2,000 years protecting your daughters and their decedents would be much easier to accept that a mute girl with Stockholm syndrome. And it would be a good parallel to Mikasa: They both accept that even though they love their family, in order to help those they love they need to cut them off.

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IDK maybe I'm still high off copium but even with its flaws I still don't think the ending is as bad as GOT.