I don't really think there is a strong argument for Led Zep not being the greatest rock band ever. As far as all their albums, they fucking rocked. Maybe you don't like them but you have to admit that they rock, every single one of the albums were solid rock, no pop shit, not hoping at all to have any cross-over genre appeal, they just rocked... And despite staying in the confines of a genre, they were very very creative.

Also for a rock band, their talent is not likely to be matched. Start off: the drummer is one of the best ever, maybe rivaled by Rush's drummer.... Jimmy Page and Robert: Enough Said.

Also while you all can bring up a few bands that rocked out a few really kick ass cd's, who has the rock-solid longevity of Led Zep?: very few bands: the stones, motorhead, etc. I think a band that has less than 3 kick ass cd's shouldn't even be considered as the greatest ever.

Also they toured alot and very impressive as a live band.

Although not led zep. as a band and similar to the Eagles and the Beatles, the members of Led. Zep. were quite successful in other ventures such as Jimmy Page solo, Robert solo, The Firm, etc.