my rankings are
#1 Part 4
#2 Part 5
#3 Part 2
#4 Part 3
#5 Part 1
part 1: i was a slf at first and wanted to skip it but i watched and it was actually pretty okay but a lil boring
part 2: way better than part 1 great watch
part 3: fun to watch but boring in hindsight and very weird, like theres episodes where characters feel babies their own shit and drink piss like.. .wtff.. oh and also have gay sex ARAAKIIII
part 4: The best part in all of JoJo. Barely anyone dies or anything like that and there is one main villain, but he's actually not even that powerful and just wants to remain hidden. He's not like Dio at all, he's not all powerful and wants to take over the world, he just wants to kill people and live a normal life. He's not even that evil when you think about it that way, nigga just wants to blend into society while jerking off to women's hands. But yeah, I like how Part 4 is all about redemption and friendship, like all the side villains mostly never die, they just get beaten up and they learn a lesson and most of them join the team. At the end it becomes basically the entire town vs Kira and I really like that because of how wholesome it is.
Part 5 another amazing part with different pacing, doesn't have much at all to do with the main cast of JoJos and introduces new characters and concepts that I really enjoy, but you know, King Crimson is a bit of a mind fuck, still even somehow idk.
Part 6: Was quite boring but the more I watched, it got better and better once I got used to the fact that Jolyne was never going to leave prison or whatever. I kind of hated part 6, but the MAIIDOO IN HEABUNN is what kept me watching. The final showdown between Pucci and Emporio (Enporio? or Emporio? I read a lil bit of the manga, Hermes is actually Ermes, etc. Jolyne's stand is Stone Free but fucking netflix subtitles call it Stone Ocean like fuck off) was amazing and the universe reset got me genuinely scrambled as to what happened, especially in that other universe where Jolyne and Jotaro aren't joestars. Did they still have their powers?
The concept of fate in JoJo is just really weird in general imo.
Part 7 and 8 or 9, haven't read yet. I've heard great things about them, but I can't be bothered to read.