All right, then what about how Eren somehow has the ability to control Titans even though none of the other human --> titan people have it? Oh, and he so happened to gain the power at the most convenient time possible so he could save everyone?
Or how about how Christa, a character that had close to no relevance to the story, is suddenly a princess without much foreshadowing? And how many other plot points show up without much foreshadowing, making the story pretty hard to follow for me?
Look, maybe I overexaggerated how bad the manga actually is, but I personally stopped caring after the end of volume 12.