From everything I've read, they pretty much suck as human beings...although I've never really read anything bad about Jones, but I have read plenty about the Diva, the Junkie, and the Thug.
They've recorded some legendary songs, and songs that suck.
They sold one of the legendary songs to Cadillac, so they suck for that.
But the main reason I'm not a big fan of them as human beings is that little incident with one of Bill Graham's employees. That was just chickenshit through and through, no matter how you slice it.
The Oakland incident
In early 1977, Bindon was hired by Peter Grant on advice from tour manager Richard Cole as security co-ordinator for English rock group Led Zeppelin during their concert tour of the United States. He had previously provided security for actors Ryan and Tatum O'Neal. Bindon took his job to the extreme and developing an addiction to cocaine and heroin, during the tour, much violence occurred behind the scenes directed mostly at journalists, bouncers, and concert staff. The band did not realise the extent of what was happening until their concert at the Oakland Coliseum on 23 July 1977, near the end of their US tour. Upon arrival at the stadium, it is alleged that Bindon pushed a member of promoter Bill Graham's stage crew out of the way as the band entered via a backstage ramp. As a result, tension had been simmering between Graham's staff and Led Zeppelin's security team during the day, and as Grant and Bindon were walking down the ramp near the end of the concert, words were exchanged with stage crew chief Jim Downey, which resulted in Bindon knocking Downey out cold <5>.
Just minutes later a separate off-stage incident occurred. Bill Graham's security man Jim Matzorkis was accused of slapping Peter Grant's 11-year-old son Warren for taking a dressing room sign, and the ensuing argument escalated into an all-out brawl. Led Zeppelin's second Oakland show took place only after Bill Graham signed a letter of indemnification, absolving Led Zeppelin from responsibility for the previous night's incident. However, Graham refused to honour the letter and assault charges were laid against Grant, Cole, Bindon, and John Bonham when the band arrived back at their hotel. The four received bail and later pleaded nolo contendere, receiving suspended sentences. Bindon was dismissed by the band and returned to England. Grant later said that allowing Bindon to be hired was the biggest mistake he ever made as manager.<6>
http://en.wikipedia.org/wiki/John_Bindon