JoJo OVA prequel isn't really worth watching, it's too slow and way too serious. First three episodes of the old OVA are surprisingly good (those with Iggy and D'Arby the Gambler). Episode four with Vanilla Ice made me RAGE, because they turned epic fight into silly slaughter. Last two episodes with Dio and ZA WARUDO can't be bad, but they still lack some famous elements like steamroller throwing and WRYYY. Also seconding Shizuka's statement, don't watch it before reading JoJo part three.
tl;dr - not really>>12970821