First of all, Jimmy Page must have lot of guts to get a bass player, dummer, AND a singer for a band.
On a more serious note, I have no problems with Jeff Beck's personality. However, his professional musicianship isn't too great. He has been known to not show up at gigs, throw fits, leave during gigs, etc. It's just my opinion, but unless there is a serious, if people pay money to see you play you need to play the gig.