Yeah to me a mentor crown ought to represent:
1. Having played enough to know the basics of the game, but is not necessarily an expert at every job or instance or questline
2. Wanting to help others and is willing to be patient with those still learning/returning (doesn't mean putting up with abuse though or outright demonstrations of apathy/refusal of effort)
3. Willing to be an example, even if it means asking for help or patience in addition to offering it
The mentors-are-@#$% horror stories tend to be fails mostly for #2, whereas the being-a-mentor-is-@#S% horror stories tend to come from others not understanding/agreeing with #1 and #3