I just want to point out that Nirvana was huge before Kurt Cobain killed himself. I was a big fan then, and saw them live. I don't see them as an over-rated band, because no one ever talks about them unless something of interest comes up, like the HoF induction, or if Dave Grohl is in the news, or if Courtney Love is in the news. Honestly, I have little/no respect for the Rock n Roll Hall of Fame to begin with. But I do like Nirvana a lot. One of the last non-designer bands to have reached diamond certification, despite the lack of promotion.
We used to joke back in the day that you could tell a Nirvana fan from a casual listener, because the Nirvana fan's least favorite song was Smells Like Teen Spirit, but the casual listener still liked it.