Most are, yes.

But that is because people do largely have unrealistic or inappropriate expectations of what a mentor should be, they aren't really designed to be anything more than a simple signpost for FAQ-esque questions e.g., "When do I get my Chocobo", "How do I unlock xyz"

It doesn't really help either that there is a status symbol and mount locked behind it - Because this means that people will oft' work towards it for cosmetic reasons - Rather than actually wanting to help people. There should be no symbol whatsoever for becoming a mentor. Equally, there should not be a mount locked behind it - At best just a Framer Kit for reaching that level. Achievements, sure. But they should be like the commendation achievements, in that the score they give is 0.

You will rarely actually find people that are useful and/or helpful. There are countless people that are just simply bad for it - and I mean people that are teachers/mentors by career.