Better early on
I've been collecting episodes of this show from internet collectors, (I understand it's now out on DVD), for a while and it didn't seem as good as I remembered. It was kind of light and goofy and presented a santized version of the issues it dealt with and of high school kids. It resembled "Saved By the Bell" more than "Mr. Novak", the all-time teacher show, which I also have collected. (My mother was a high school teacher, thus the interest.)
I recently got the first two episodes and have watched "Richie's Story". This is the show as I remembered it, serious issues, (the inadequacy of inner city high schools, Alice being intimidated by her first classroom, which includes a rebellious black student), presented with a humanizing spoonful of sugar in the form of some mildly comic elements that don't get in the way of the story. I've read that the network wanted to lighten up the show and emphasize humor more and I think they succeeded- in destroying the delicate balance of the show. In the later episodes the fact that Pete and Liz are black becomes basically irrelevant. That, in a way, is a triumph but it also means the series has moved away from some of the issues it was created to deal with.