alt Hacker NewsCore meaning: Barely adequate, average, or just acceptable.
Mediocre means of only ordinary or moderate quality—neither very good nor very bad, and often slightly disappointing
The quality is average but expectations of high quality are not met. He expected more but got what he asked for. We overuse top models because of this.
The claim was there is no difference between Opus and Fable but to me there is.
Opus delivered mediocre results. Not garbage, but would have required me to do lot's of things myself. Fable did not needed my supervision with this task.