Into the first few episodes, i was comfortable with the direction of the series. Onizuka decides to become a teacher, but has diffuculties when he keeps creating setbacks for himself. Many of the episodes focus on the development of the characters. Onisuka, as the teacher, gets to be in charge of a classroom full of troubled kids. These kids all seem to have a reason to hate all teachers. So Onisuka, tries to win everyone over by solving the problems that the kids have. The story seems to flow nicely as it deals with the relationship between the classmates, otherwise the episodes are fairly episodic.
One of the nitpicks I have about the series is the distorted sense of realism. Most of these cases are at the beginning. There are a few things that teacher Onisuka can do, but nobody cant. I know this is an anime, but all characters should be relative to the other characters.
One refreshing aspect of Onisuka's character is that he is somewhat of a badass. But this is a double edge sword. Even though he always make the bad guys pay (showing no remorse while having revenge), for everyone else, he seems obnoxious and authoritative. This makes a weird mix because he is supposedly a very laid back guy, not to mention that he always help people. Very happy-go-lucky guy.
In the end, I found this series easy to watch, despite the minor faults and old style animation.