A Band from the the 60's that has influenced many bands, past and present(Van Halen's tapping technique was inspired by the "Heartbreaker" solo). I don't think they were overated, I can't really see how they could be. I think bands like Greenday and Nickleback are overated. Jimmy Page was an amazing guitarist who created many different sounds by using very creative methods( e.g The violin bow on "Whole Lotta Love" and "Dazed and Confused"). Also, John Bonham inovated drumming techniques with his unique style and super fast beats.(listen to Good Times, Bad Times or Moby Dick). Im not really sure that Led Zep alone were the "Creators" of Heavy Metal, and I think someone pointed out that Black Sabbath was doing their thing before Zep, but Led Zeppelin was one of them. Also, Led Zeppelin would have to be one of the most versitile band's in the world because they can do various types of songs(e.g. "Thank you", "Since I've Been Loving you", "Rock and Roll" and "Dazed and Confused" are all diferent styles). Sure, fads come and go but in my opinion, Led Zeppelin wasn't just another fad, because if they were, kids like me( i'm 14) wouldn't be listening to them. They may not be the "Greatest" rock band ever, but they're somewhere up there.
The lyrics in Led Zeppelin's "Stairway to Heaven" is very mystical, Does it make you wonder?