I've been watching ATLA recently since I've never watched this show as a kid. I might make the whole Team Avatar. Anyways, I really loved the show and the sequel series, TLOK. Though I knew that Zuko would eventually join the team, I appreciate that he was not readily accepted into the team and that he had to earn their trust. After all that he did, I wouldn't trust him right away either. He was willing to change but had to prove to them through his actions and not by saying that he had changed.