I hear what you mean about his singing. Sounds like a punk rock vocalist. I wonder if he was naturally that bad, or was he intentionally trying to be anti-80’s, like some of the late 80’s, early 90’s bands were trying to be. That kind of punk attitude was creeping into hard rock/ metal around that time. Cobain did some pretty rough vocal tracks on some of the Nirvana albums…Although he wasn’t technically a very good singer, I liked how his voice sounded on some of their songs. He had a cool raspy voice when he wanted to. Technically weak, but interesting.