I understand your point but an anime does not have to simply have fights to be good or interesting cases like Deaht Note, Monster or even Boku Dake proves it although if it is true the fights are not that entertaining.

Eren is regular, neither he is the best protagonists nor he is the worst only that he acts natural, not all are Super Saiyan or have super powers and although we are accustomed to that in the Shonen demographics, it seems to me that characters like Shinji are the best because they are natural.

That if hahaha it was very obvious about the twist but hey although we do not expect it in general line the anime is very good from my opinion because in addition to Kimetsu or One Piece Isayama's work has gotten good reviews and sales (I know SAO is the same but good There are exceptions>. <) and I find the story super entertaining, taking animes out of the ordinary.