The ending of AOT was not perfect, but it definitely delivered a satisfying and bittersweet ending to a great story. HxH will never finish, One Piece is too long, and JJK will never be as sentimental and deep as AOT. I don't see another anime bringing as much as tears, action and story as AOT for a long time and this is saying something. Isayama is a genius and AOT is the greatest anime ever!