So I have a few opinions as a non-manga reader. Based on the comments I've seen so far, it seems a lot of readers who hated the manga ending were a bit more ok with how the anime executed it, specifically with how they changed Armin agreeing to Eren's genocide plan in the manga.

My one minor gripe is how Eren/Ymir undid the titan change of the secondary/minor characters (Jean, Connie, Gabi, Annie's/Pieck's/Reiner's parents, etc.). I feel like the impact would've been greater if only the primary titans lose their abilities, and the rest died. Jean and Connie's conversation before they turned was amazing and them coming back made it lose its impact. Then maybe Annie and Pieck go into self exile because of what happens and only Armin and Reiner return as ambassadors. Oh maybe Annie stays for Armin.

Question for the people who are more knowledgeable: I get Eren and Armin conversing on the beach and Eren wiping it from Armin's memory until the after the end, but when does Eren and Mikasa hiding out in the countryside happen?