Earlier quoted context omitted.
I like Nirvana as much as the next 90s kid but there is no way these are the best songs in human history, or even in rock history, or even in "modern rock" history.
It's because the fans who like Cobain's songs overpraise him or praise him in the wrong terms: "OMG Kurt Cobain is a genius songwriter." I think, and as this post suggests, it's much more the case that "Kurt Cobain had very good instincts for someone completely untutored" which is a different thing altogether.
I am very clear though, that "genius" and "intelligence" are unrelated but sometimes coincident.