Mentors in this game have such a bad reputation that it's become a meme. This is unfair to actual mentors who enjoy helping sprouts but I think the problem is how the mentor requirements are designed.
What are the current requirements?
-Run a ridiculous amount of dungeons.
-Get a ridiculous amount of commendations.
What's the problem with reqs? This design focuses grind over helpfulness. I see that the idea behind that is that presumably someone who has run a lot of dungeons should have a decent amount of knowledge and the commendations are intended to do some kind of quality control. There are two problems: 1. having run a lot of dungeons doesn't make you a good mentor and good mentors don't necessarily run a lot of dungeons. 2. Commendations aren't used as intended.
Regarding 1. This sort of requirement may be particularly attractive to people who like to peacock their own mastery by putting down others. Then there are people who have lots of knowledge and are happy to help but they don't enjoy grinding dungeons.
Regarding 2, the commendation function is probably intended to tally up players being helpful. The problem is that most of the time, people will just give their commendation to the tank or healer regardless of whether they did anything helpful and DPS rarely receive commendations even if they discussed all the mechanics, gave advice or answered questions. Many people also give commendations arbitrarily on such things like whether someone had a good glam or a funny name.
What is an ideal mentor? Someone who enjoys helping other players. They explain mechanics and if tanking ask healers what size pull they are comfortable with. They respond to players who shout out questions or ask for a raise in shout. They go out of their way to party up with sprouts to help them with their quests or try new stuff or give them an exp bonus. They give helpful advice when they see someone struggling without being overbearing.
I think the requirement for having done x amount of dungeons should be scrapped in favor of either having finished the current expansion or having unlocked and completed x dungeons and raids. That is enough to ensure the player is knowledgeable.
Commendations should be redesigned to work in and out of dungeons and be focused on WHY the commendation was given. Maybe you could write /thanks4explaining @player or select the player's character and give them a commendation from a menu that gives you the option to decide what you are commending for (e.g. being helpful, explaining things, great glamour, saved everyone from wiping, etc.) and only factor in commendations that are related to being helpful and explaining things.