[E. The Kidd]

I think a good mentor is a person who'll stick with a team despite its obvious short comings...

With my old team I have seen mentors sleep in our school, work through mini blizards until 5 am, and put college classes on hold just to help us produce a working robot in 6 weeks. (note: that at no point was it easy for our mentors because of the lack of support from our school and the lack of supplies needed to build the bot)