This particular question was recently discussed on Reddit (https://www.reddit.com/r/television/comments/114xo75/head_of_the_class_19861991_is_it_worth_watching/). Do you agree with the opinion that the (https://web.archive.org/web/20140406113111/http://forums.televisionwithoutpity.com/topic/2154217-head-of-the-class/?view=getnewpost) show (https://tvtropes.org/pmwiki/pmwiki.php/Series/HeadOfTheClass) pretty much went thru a soft reboot by Season 4 (https://headoftheclass.fandom.com/wiki/List_of_Episodes#Season_4_(1989%E2%80%9390)), and feels like a Saved by the Bell clone, especially that museum episode?

It was also by this time that three students (https://santiago.fandom.com/wiki/Head_of_the_Class#Cast[edit]) were inexplicably (https://web.archive.org/web/20061031125301/http://www.jumptheshark.com/h/headoftheclass.htm) written out and replaced and Howard Hesseman's role was diminished. Even the show's intro (https://www.youtube.com/watch?v=fiueeEyb9n4) was replaced.

I think so. I liked a lot of episodes in Season 4.

I have mixed feelings about the last 2 seasons, largely because of the Viki character, who always annoyed me because of her new-age stuff.

It may not be as good as the previous 3 seasons, but it was still worth watching.

Yes, any seasons 4 and 5 episodes are worth watching to me.