I watched the 2012 (which covered parts 1-2) anime and loved it. Can't wait to watch part 3. I almost watched the 93 and 2000 OVAs but people say they don't faithfully adapt the manga so I'll wait for the 2014 adaptation.
I first heard about "stand users" in one of Gintama's arcs (which frequently makes fun of other mangas/anime =D) but I didn't know what they were making fun of until I learned about part 3 of JoJo's.