Meta-reviews might help; for instance, on Slashdot, periodically being shown random comments from others, with ratings, where you can say whether or not you agr

Meta-reviews might help; for instance, on Slashdot, periodically being shown random comments from others, with ratings, where you can say whether or not you agree with the original rating. At least that way, some additional scrutiny occurs (maybe not objective individually but probably an improvement when aggregated). I guess in Uber’s case this might be implemented as: randomly showing previous riders a rating for a driver they had, and asking if they agree.