Obnoxious as in he tries to turn the base guitar into a lead instrument all the time. I know he probably doesn't mean it that way, but he sounds completely self-obsessed most of the time to me.
Also, many people have already voted here according to whether or not would they want these people in their band and I definitely wouldn't, because he's also obnoxious in his image, IMHO. His attempts at Zappaesque humour grate my nerves too, after a while. I know that's very common among musicians - I mean, Bumblefoot does something like that all the time, so does Gilbert and sometimes Vai too, but I can tolerate it with blokes I can actually listen to and appreciate. I had a huge Primus phase in college and since then I'm ... possibly...
oversaturated, let's put it that way.
As for that metalheads comment, Primus have always garnered sympathy from the metalheads thanks to Claypool's and LaLonde's past (Blind Illusion and Possessed), being friends with other metal bands (auditioning for Tullica etc) and playing big festivals. That's why I wouldn't be in any way surprised if Claypool won against 70's funk star on a metal forum. Sorry you lot if you felt as if I was pigeonholing you in any way.
He's very original, I admit as much, but I'm not so sure I would call him a great "bassist", if you know what I mean. Much as I'm not sure I would call Tim Buckley a "great singer" (though I certainly wouldn't have such qualms about Mike Patton, if you can tell the difference).
P.S. - you sods eliminated Jaco, Duane, Haynes, Oldfield and others almost immediately, so excuse me if I'm gonna be sceptical regarding metalheads sometimes
P.P.S. - nevermind, found it:
Eliminated after Round 26:
Carlos Santana
Eric Clapton
Steve Morse
Steve Vai
Promoted after Round 26:
Glenn Tipton
Joe Satriani
John Petrucci
Mikael Åkerfeldt
This. You let this happen.