I think about this sometimes. Our intuitive definition of the average ${thing} seems to be the average of ${thing}s we've seen before, but we don't ever see the vast majority of ${thing}s. The average, finished, published game is probably well below the average that we've seen.

Producing a game that most people think is average is actually an achievement, because they're comparing you to a list that includes the likes of Skyrim and Assetto Corsa, but probably doesn't include all the variants of Unity Store Asset Simulator. Same for books, music, artwork, sport, and pretty much everything else.

Half the games are below the median.