Thomas Shey
Legend
In my opinion, quality of a TTRPG means that people enjoy playing the game and continue to play it. Therefore it is a quality game for me and the people I play with. If we broaden that out to the larger target market we can't directly measure enjoyment or retention, the only thing we can do is extrapolate those from the data we have. The data we have is sales and, continued sales growth (up to a certain point anyway, eventually we'll see market saturation).
By your definitions and the irrelevant topics brought up on this thread, the word quality has no meaning.
By the definition you seem to be using here, only you matter.