Horrible character writing, showed by characters such as Mikasa and Eren, especially the second one, who went from a hot headed typical protagonist to being a cold blooded mastermind in like 2 chapters because of “muh timeskip” without any type of expanding into it.
Dumb plot, ad showed by for most, the entire political arc: “oh, remember that whore I fucked once and had a daughter with? Yeah, the kid is like the most important person in the kingdom right now” —Historia’s father and the King. Or the part where the bad guys were like: “Sup eren, it’s your boi armed titan and colossal titan here, you know, the guys who killed your mother and traumatized your childhood, what about coming with us to a nazi regime where you will be killed, huh?”, like wtf.
Extremely cliche, the big premise of the show is saying “nobody is safe”, but the only real character that dies is Erwin and Potato Girl latter on. Besides that, everybody acts as AoT innovated shōnen, but in the first two eps you have literally all cliches possibles, like the cold rival character in Levi, the hot headed protagonist with a demon or secret power inside and with a tragic storyline direct tied to his power and it goes on and on