Style - If there's one thing JJBA has in abundance, it's style. The art and animation in this OVA is absolutely wonderful. The character design is very stylish (I don't mind the fact that everyone looks like a bodybuilder), and the animation is fluid. The fight scenes are awesome. 3 out of 3.
Character - The characters have some recognizable personality but are not fully fleshed out. Jotaro is a bit of a thug - he broke D'Arby's finger for attempting to cheat at poker. Polnareff is a manchild, he is arrogant and constantly gets into fights for no good reason. That's about all that can be surmised from the little amount of character building that happens in this short OVA. There are practically no scenes devoted to character development, so we really don't get to know the characters in depth. Actually most of the character development happened in the 7-episode prequel OVA. The Joestars want to save Holly and the other team members are there to get revenge on Dio. So the overall picture is there, but the characters aren't quite fully fleshed out. Overall 2 out of 4 for having undeveloped yet sound characters.
Story - The story is pretty much nonsensical. Stands are somehow related to Tarot cards? This is never explained or explored. The villains are extremely inefficient at trying to kill the protagonists (I suppose if they were efficient, then the protagonists would never succeed) for example Hol Horse confronting Polnareff in the middle of the street and telling him about how his gun stand is superior to Polnareff's sword stand. Dio Brando being terrible at using his stand. Vanilla Ice acting like a complete idiot to get hit by Iggy and killed by Polnareff who was lying on the ground right in front of him. Jotaro suddenly developing the time-stop ability OUT OF NOWHERE just to defeat Dio. Polnareff jumping in to save Jotaro just as Dio is about to decapitate Jotaro. Dio landing exactly on Joseph's body after getting furiously punched by Jotaro. The entire stand thing makes no sense and the whole story is based around stands. It is truly bizarre. 0 out of 3 for not making any sense.
Oh and also, I might add that chocolate EXPANDS when molten, so the whole idea of D'Arby melting chocolate to make more room for an extra coin to be dropped into the cup makes no sense at all.
Overall 5 out of 10 for having undeveloped characters and a completely nonsensical story.