Rurouni Kenshin has been ruined to me,
due to the whole child porn thing, as was Attack on Titan,
because of all the antisemitism. A lot of anime just...has not aged well, imo.
I could probably rewatch JoJo's Bizarre Adventure countless times. (yes I know there's the whole thing with the Nazis in part 2, but they're still painted as "these are not the good guys," so there's that). It's actually a good anime, it's so stylized and they utilize all of Araki's wild color palettes (and even some textures, like in p2). But also it's very silly so it's fun.
As for "anime that's good that you told everyone about," that's Akudama Drive. PLEASE WATCH AKUDAMA DRIVE it's "what if cyberpunk reservoir dogs" Just like JJBA, it's peak "a Japanese guy really, really, really, really likes western movies and, god, does it show." It's only 12 half-hour episodes so it's easy enough to binge in one sitting but, emotionally, it's A Lot. And no one has watched it and it's SAD!!!!