Tom Shales was a widely admired columnist for The Washington Post where, he says, he "spent roughly 39 varyingly rewarding years, most of those as TV critic."
"Varyingly" is the key word. Shales, in a post on the About Editing and Writing blog by Jack Limpert, former editor of The Washingtonian, explains that much of the "variation" in his rewards came from editors he had, a few of whom were great, and most of whom were awful. There is no room for mediocrity in Shales's universe.
If you're an editor, you might be inclined to stop reading when you get to this, in the third graf:
I regularly denounced editors as a species, insulting them with such disparagements as, “Those who can, do; those who can’t, teach; those who can’t even teach, edit.” Editors, I liked to say...