It's nice that FFXIV decided to mark all the jackasses in Duty Finder. They're the ones with a crown beside the name.
For those of you who don't play FFXIV, the crown denotes a "Mentor", a high-level player who is supposed to help new players. However, in my experience, people marked as Mentors are equally likely to be the people who are unpleasant in groups.
There's no denying that the Mentors are qualified players. FFXIV has quite high requirements. You need to have at least three classes at max level, a tank, healer and a damage dealer. You also have to have done a thousand dungeons, which is a crazy amount. As a result, Mentors are the top slice of people in the game.
However, I'm not sure if they are the best players to advise new players. Being edge players, they have a tendency to use and expect edge strategies. Giving too specific and complex advice instead of ensuring mastery of the basics.
Also, and this may be a skewed perspective, they also seem to be most impatient, especially on older content which is trivial for them.
In some respects, I think the people below the edge tier would make better mentors for new players. They would still be decent at the game, but would be closer to the new player experience, and better able to give advice from that perspective.
To put it into a WoW perspective, currently you need to be a Mythic raider to be a Mentor. It might be better if the Heroic raiders were Mentors, and Mythic raiders expressly prohibited from being Mentors to new players.
It's kind of like a university, where professors give high level lectures, but graduate students are the teaching assistants and help students with problems. A lot of time a professor is too far away from the student experience to really see the issue.