Best JoJo? Joseph motherfucking Joestar ( Josuke is tied for me )
Best story? Steel Ball Run
Weakest story? Golden Experience. I didn't hate it but it was so boring compared to the others but I'll admit the stands were very creative
Favorite Standy? Crazy Diamond, The Hand or Tusk (Act 2&4)
Favorite villain? Kira, Dio and Valentine
Least favorite villain? Pucci ( if you read part 6 YOU KNOW WHY )
What about you guys?

Best Jojo: Can only agree with you, with Jolyne propably being a close Second.
Best Story: Yeah, also that one.
Weakest: I actually would give this too Phantom Blood to be honest, i know, it started everything, but its clear that it could have been alot better done.
Favorite Stand: Killer Queen, Silver Chariot (that one never disappointed when in action!)
Favorite Villain: Same.
Least favorite Villain: none of the Main Villains, but ACDC, simply because he got almost nothing until he got killed off. the Main Villains overall were always well done.