After you view content (ideally immutable content like a film, music, books or computer games) -- when you offer to rate you are instead promoted on how it fair

After you view content (ideally immutable content like a film, music, books or computer games) -- when you offer to rate you are instead promoted on how it faired vs a previous experience. "You've just seen Terminator 2 -- how is it compared to The Matrix?) In terms of algorithm it's got around issues of merging incomplete Condorcet elections (as not everyone will compare or rank every item) and clustering. Turning these partial elections into a single order ranking.