All the hate-on comments, and the manga still has an on-site rating of 8+/10... Some people just can't be satisfied and will whine about the littlest thing.
Honestly, the changes in characters as the story progresses show that the story is close to it's climactic ending. Short, sweet, and to the point. It'll probably end with the MC becoming a saintess, yes, and probably being engaged to some lovely being, and either becoming a princess or something like Mercedes Lackey's Black Swan... which was a pretty nice read.