There's been a lot of noise over Advogato's trust metric lately. As others have pointed out, it would seem that people certify other people more on the basis of their personal opinion of that person than on the basis of their opinion of that person's work. To me, this clearly indicates that we need a dual trust metric, where you rate people according to their work and their behaviour on Advogato. So you can, say, certify phk as a Master for his contribution to FreeBSD even if you think he's a Dimwit to write articles like this.
[A clarification to the above: it's just an example. Though phk and I may have our differences, I don't think he's a dimwit; he's just in love, and I can sympathise with that :-) ]