Years ago I was on a high-tech free dating site.  They ask, not force, users to review flagged photos for compliance with the terms and conditions.  Nudity, not the user, google image and various other infractions were confirmed by multiple sources and then removed.  Waiting until something was flagged allowed resources to be directed more efficiently.  Asking people to participate left the job to people with a genuine interest in the integrity of the site.  Forcing people to rate comments on articles they have not read will not result in elevated discourse.  More likely the result will be less engagement from the community.