Also, I don't quite get how Nirvana is overrated. Overrated, to me, means that people think they're a lot better than they really are. Whether you like Nirvana or not, you have to admit the lyrics were awesome (if you could decipher what they meant) and the music was raw and to the point - fit the lyrics perfectly.
Flat out, they're a legendary band a la Beatles/Zeppelin. How can a band like that be overrated?
[edit]
That'd be like having an under/overrated movies list and saying "The Godfather" is overrated. C'mon now... even if you don't like the movie, you KNOW damn well it's mark in movie history and the fact that it is easily hailed as one of the best movies ever made instead of a passing fad. Something like that can't be overrated because... yeah, I can't even explain why, but I'm sure you get what I'm sayin
There's a diff between a passing fad that's overrated and something that HAS a place in history. When kids actually start listening to music (as in.. real music and getting away from current mainstream), the most common bands they'll listen to are: The Beatles, Led Zeppelin, The Doors, and Nirvana. Of course, not always 100% of the time, but I know quite a few people in high school and I can pin point who's actually getting into music as opposed to those who just listen to the radio.. and that's typically the result set.
Also, you can bet any money that when the next "Nirvana/Zeppelin" storms the music scene, that band will have Nirvana as an influence.