Yes! A real mentor knows exactly what to say and when you need to hear it. But the two teachers who mean most to me now never seem to "rate" us as doing well or poorly--just offering the specific next step or correction we need at the time, not telling us that we're great or terrible.

Though with writing, some day I'll have to deal with that OK/not OK kind of reaction, if I ever expect to get published. But maybe also that's why some writers never try to get published.