Perhaps the criteria is not who does and who doesn't make mistakes but at the end of the day, did you achieve expectations and results for the assigment, sitting, shoot, or job that was done.
Every pro could tell you horror stories of botched shoots, dropped lenses, lousy assistants and bad kids in kid sittings. Perhaps the criteria is really, how was I able to handle and rectify the situation.
This is a hobby, business, passion that has so many things that can go wrong. Some of our own doing and some completely out of our hands.