@YUMDM this seems to be a result of measuring two things: which games the rpg community thinks are good, vs which games they actually play. Kinda similar to how rpg reviews work, where playability isn't really under consideration in a lot of cases simply because the reviewer can't play it as designed...
@YUMDM As I recall, Different Worlds was a BRP/Chaosium adjacent publication, so the high ranking of RQ and it's descendants over objectively more popular games is not surprising. Still, didn't expect that Traveller would come in so low.