It's not that they both matter so much as they are fundamentally inseparable. It is the quantity of qualities that matters. e.g., conceiving of it as "quantity" is like counting how much money you have by how many bills and coins you have. Not all coins and bills are worth the same. Unfortunately, the quality of a quest is seldom printed on its face.
Ok, now we're going to get slash fiction of Wint x Kachi somehere... rule 34 and all...
Never confuse your inference as the listener for an implication of the speaker.
Good games are subjective like good food is subjective. You're not going to seriously tell me that there's not a psychological basis for why pizza is great and lutefisk is revolting. The thing about subjectivity is that, as subjects go, humans actually have a great deal in common.