I do think that the mindset of “MJ stopped working on it therefore it can’t be that good” is a bit flawed. Keep in mind there are plenty of songs MJ never finished that we think are better than songs he worked on for years on end. It’s all subjective at the end of the day.
“We’ve Had Enough” is widely seen as one of the best Invincible outtakes and he bailed on it pretty early. Same with “Hot Street.” Meanwhile, “Best of Joy” (which I love but many don’t) was on his mind for nearly three decades.
I definitely think “Buffalo Bill” won’t measure up to expectations (very few unreleased songs do), but I don’t think it’s failure to make it past the Bad sessions is indicative of anything.