^^ Very good point, that's one of the reasons I think Bad is his finest album.
MJ wrote almost every single song on Bad, that's the reason why there's so unique, and no one else could sing them. If you take an album like Dangerous, I can hear some of those those songs on other people, deffo not as good as the MJ song but at least ok, they're a tad more generic IMO. However on Bad, the songs fit him perfectly they're tailor made for him. Being writen by MJ himself and produced by Quincy you can't go wrong.