I mean how bad can he be? He just killed his father, his step-father, vampirised himself, murdered a lot of people, killed his bro, returned after 100 years, stole his bro's dead body and use it, killed other innocents and almost murdered his nephews!
Spoilers up to part 6... Don't forget; Burned Danny alive (Jonathan's dog), kissed Erina to spite Jonathan and made his youth hell burned the mansion down and poisoned George who had treated him as a son. Made a woman eat her own baby (actually messed up) Countered the Thunder Cross Split Attack. Killed countless, probably off-screen, too. Manipulated probably hundreds of people. Used parasites to control people. Literally twisted Senator Philips' bodyguards arm around. Hijacked a limousine from Philips and tore his front teeth out, forcing him to drive. Groomed Kakyoin and later killed him. Nearly killed Joseph and Jotaro. And his servants killed Avdol and Iggy. Killed his own servants, discarding them with ease. Shows no signs of remorse; rather he enjoys toying with his prey. Taunting and messing with them. Has at the very least 4 children; probably doesn't know about any of them even existing. And that's just to name a few. And not even mentioning his alternate universe counterpart; Diego Brando.
the ai does three things throughout the song; it sounds good, makes dio sound like he's smoked two packs a day for thirty years, and makes him sound like hes choking on a massive thing of snot stuck in his throat. frankly i love every part of it