So I just finished watching Golden Boy (1995), since I was curious about it and was very often recommended on various lists of retro anime to watch. It turns out that the show is obnoxiously horny, reaching "I can't believe it's not Hentai" levels in Episode 5 and that the show revolves around this seemingly incompetent dude that basically thinks with his genitals and always ends up getting the girl. The comedy is also basically 90% sexual and with such a setup, you can't really expect much else than objectification of women.
The animation quality is neat and the ED song is catchy though. 5,5/10
The above description might sound familiar if you've watched Great Teacher Onizuka (1999), which is similar in concept, except it includes a pretty good story and interesting characters. Unfortunately, it also is obnoxiously horny (which makes it creepier than Golden Boy due to the setting of GTO), is very ableist towards one of the students of Onizuka's to the point where episodes centered around them become unwatchable if you have a single ounce of liberatory ideology in your head and the show has some really bad filler episodes.
7/10? Sure. 8,69/10, like the MAL rating says? No chance in hell.
I don't really have examples of underrated shows or manga that are noteworthy enough to warrant me complaining about unfortunately.
I really like Jojo, but yeah, the Indian arc in Stardust Crusaders felt kinda racist and there's snippets of bad politics, male gaze, etc. through out the other parts too. Also Steel Ball Run, which is considered to be one of the greatest manga of all time, had a really bad beginning and while admittedly the story was pretty good, most of the characters were forgettable with only a few exceptions and the self-referentiality was annoying.
At least, as far as fanbases of large anime franchises go, Jojo's is alright beyond the annoying Rudol von Stroheim memeing.
Not a masterpiece, but I'd give the series a 8/10.