I don't really understand how this is rated so high. Maybe it's literally just for the meme's that have been generated around this anime. However the anime itself is pretty bad in my opinion.

The animation and its style is poor. There are often just still images or slow movement. Then there are certain Japanese written characters popping up on screen to apparently highlight movements or things that happen to the environment. Imagine that the ground is trembling due to some action but instead of seeing the actual impact of the action you see some weird signs popping up that you can't even read.

I made it to episode 6 before I couldn't stand to watch it anymore. However from what I had seen the characters in the show are rather one dimensional. Jojo is just good and overly trusting. Dio is simply just bad for the sake of being bad. Then there is Speedstar who for whatever reason is just kinda in love with Jojo. And we have a basic mentor kind of character that "teaches" Jojo the use of Hamon even though he basically just picks it up instantly and becomes very good very quickly. There is nothing really to get me invested in these characters as they are boring.

The dialogues are painful and basically just focused on exposition and yelling at each other things like "You are bad!", "I'm going to stop you." and "I will kill you.". There is nothing interesting there.

If you enjoy this show, then good for you. Maybe for some this is just in the category of it's so bad that it's great. For me though it's just bad.