Are there any good trust, value, or reputation metrics in the open source space? I've recently established a small internal-use Discourse forum and been rather appalled by the limitations of what is intended to be a next-generation system (status flag, number of posts, tagging), and from a quick overview most competitors don't seem to be much stronger. Even fairly specialist fora only seem marginally more capable.

This is obviously a really hard problem and conflux of many other hard problems, but it seems odd that there are so many obvious improvements available.

((Inspired somewhat by my frustration with Karma, but I'm honestly more interested in its relevance for outside situations.))