There's probably a lot of low hanging fruit, for example use of correct priors, e.g. given Gaussian prior distribution, a quite strong proof should be needed before you should believe someone (including yourself) has very high intelligence or expertise on a task.

Furthermore, many ways of evaluating people are to some extent self reinforcing as the people being evaluated are aware of evaluation. A smart person or expert can relatively cheaply demonstrate intelligence and/or expertise, in some way that provides very strong evidence, and will do so even for relatively moderate payoffs. Likewise, very selfless people can cheaply (in terms of their utilons) help strangers, and will do so for lower payoffs than people with more selfish utilities.

Other issue is gradual updates on huge amounts of weak, possibly non-independent evidence.