Currently at the 2/3 of the book; so far it's crap.
Story, writing, characters, all disappointing.
The plot is nonsensical, with a rhythm all over the place. Beyond and Wound are just Stands with another name, there was no point in introducing such underexploited ideas. Even then the "Stands" the author bothered to "think of" are just shit plot devices which only serve as a one time pretext for a particular dialog to happen, special mention to Grand Bleu which is a glorified taxi. Detective stuff had potential but was soon replaced by pure wtf. Don't know if BuddyWaters is to blame, but writing is bland as fuck, dialogs, expressions are all so badly written... Also, he doesn't seem to grasp that no one in English says "eh?" to indicate confusion, we say "uh?", maybe "what?" but not "eh?".
Both Jorge are lame characters, one is a whiny and weakwilled guy with forced romance and character development. The other doesn't even qualify as protagonist, and is bland as fuck.
The author clearly shits on the canon. Every reference is shallow, i can't even say counterpart since every character vaguely inspired by a canon one is a hollow reference and one dimensional character, like Narancia who's now just a psychopathic brat. Kars is also a lame walking deus ex machina. The only scene that I appreciated was Erina and Dio's. Worst of the worst would be Lisa Lisa being a cliché tsundere.
I was curious about the novel, but what I thought were bold writing decisions were in fact just here for wtf factor. Jorge Joestar is shit, don't read that.
EDIT: "Loving you is a foundation of my personality!" - Lisa Lisa, Jorge Joestar. Go fucking kill yourself Otaro Maijo