I can understand why you found Naruto's behavior during the Kazekage rescue and Tenchi bridge arcs annoying. He was reckless and impulsive, and he often ignored Kakashi's advice. This could have led to disastrous consequences, as you mentioned.

I also agree that Naruto's treatment of Sai wasn't great. Sai was a new member of Team 7, and he was trying to fit in. However, Naruto often made fun of him and treated him like an outsider.

I think it's important to remember that Naruto was still a teenager at the time of these events. He was still learning how to control his emotions and make responsible decisions. He also had a lot of baggage from his past, which affected his behavior.

I agree that Naruto's true growth didn't occur until the Pain arc. In that arc, he was finally able to come to terms with his past and learn to control his anger. He also realized that he couldn't save everyone on his own. He needed to rely on his friends and teammates.

I'm glad to hear that you enjoyed Naruto's character development in the Pain arc. It was a great turning point for his character.

I think it's also important to note that different people have different opinions on Naruto's character. Some people may find his annoying behavior to be endearing, while others may find it frustrating. There is no right or wrong answer.

Ultimately, whether or not you enjoy Naruto's character development is up to you.