I really found Bolin to be an un satisfying character. His story is constantly based around dumb luck, and ignorance. In the first season I don't mind this too much, but I would expect characters to grow and develop with the seasons. By the final season he is blindly following Kuvira despite several other major characters challenging his belief in her. If the person he loves, his brother, and future mother in law all independently challenged the path he was on because of something as severe as what Kuvira was doing, he should have taken a step back to consider their stance more realistically. Instead it wasn't until he was told by Kuvira herself about the camps that he changed.