For a *machine?* Human mediocrity would be *spectacular.* Let's say, instead of something trivial like art, we had AI who turned into mediocre, average human doctors and diagnosticians. Would you rather have a *great* human diagnostician than a mediocre AI one? Sure. But you could actually *have* a mediocre AI diagnostician in your home. It non invasively scans and examines you three times a day. In contrast, one American a week gets to see Doctor House, and then pay out the ear for the privilege.
Similarly, the police could have ten thousand mediocre detectives scanning the evidence nonstop, where the good human detectives can work on one case at a time. A million mediocre AI astronomers scanning the skies looking for comets, asteroids and aliens.
An army of mediocres could do vastly more good than a few experts. And these are mediocres that simply didn't exist until humans invented them.
Yeah, but those aren't real people, and thus the audience won;t connect with them. Or so I've been repeatedly told.