@chikara @freemo I am coming late to this discussion, and I mention what follows with fear and trepidation. I'm curious whether this kind of system has been considered.
I have occasionally admired the results of Slashdot's moderation and metamoderation system even though I certainly heard participants complain about it. I never created an account there and always read anonymously, but I did find the quality of the comments that percolated to the top was generally fairly good even when the site was far more active than it is now.
I don't mean this to be flippant. You guys are talking in terms of peer review. For all its numerous faults, peer review has high ideals. Let experts judge noteworthy work. The Slashdot moderation system is hardly all that.
I am also unsure how exactly a moderation and metamoderation system would translate into the context of a Mastodon instance.
Nevertheless, from the perspective of an outside observer Slashdot did seem to select a fairly reliable set of moderators from a large crowd of mostly anonymous individuals some of whom were openly pushing specific agendas. And with the metamoderation system they took it a step further to answer the question: quis custodiet ipsos custodes?
As I understood it the system tended to select moderators that were long-time readers who did not have a history of negatively-rated comments. That was basically the standard of "expertise" required of a moderator, although there were some instructions to encourage moderating based on how the comment contributed to the discussion, not whether the moderator agreed with it or not.
In any case, I suspect QOTO has attracted a specific kind of participant because of the way it describes itself and the tools it makes available. It would certainly be a shame to see that drowned out in the noise as it grows.
All that said: growing pain is the best kind of pain there is! Congratulations.