Currently the mentor system needs some work, and a good start would be to improve the minimum requirement to be a mentor over and above simply having one of each role at 60 (Healer, DPS, Tank).
Here is why...
I am currently not a mentor, mostly because I did not bother levelling a healer role from 50-60 when Heavensward was released. Meanwhile my /playtime is logged at 643 days, I have beaten A12S, I have all DoH/DoL classes at 60 (despite being lazy with collectables) and all round consider myself a veteran player. I mostly play battle content, yet I am not a mentor due to the requirement of having a healer at 60.
Now this post isn't just me whinging that I am not a mentor (because honestly I don't care to be one). I am however highlighting the fact that if I wanted to, someone who has played the game since 1.x, has logged nearly 2 years of "logged in" time, and completed the highest tier raid in its current state, does not meet the requirements.
Let me tell you another short story -
I am currently levelling AST to kill a bit of time during this dry content spell we are in. I queued into Darkhold, and noticed the tank was a mentor, and the two DPS had the plant icon (one new, one returning).
The mentor (tank) didn't pull the mobs into the crystal protection so the eye kept AoE'ing the party (not a big deal, I just healed through it) and asked them to move into the blue aura when I had a spare moment. Mobs continually aggro'd me (specifically ghosts) as they didn't pull the melee mobs to the ghosts in order to be able to hold hate.
This tank also didn't pull the first boss into the blue crystal for a good 15-20 seconds, and the new player actually asked him to. I found it amusing that the new player was mentoring the mentor.
Finally, for the entire dungeon the tank would stand in every single ground AoE without even attempting to dodge. By that I mean literally just stood there while the AoE went off without taking a step in any direction. I asked them to please try to attempt to dodge the ground AoE (twice) however they didn't.
At the end of the dungeon the tank (mentor) said "Sorry" in /say chat. I am unsure if this was an indication or not that the player just didn't know how to type in party chat, and they must have been that new.. However it baffles me how a player of this standard can be given the mentor flag for battle classes.
I originally thought this player was simply new to tanking, however I realised that in order for them to be a mentor, they would have had to level a Tank to 60.
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Finally I wish to add that I by no means judge these players as most of the time I put it down to them just being new, or having less experience than me and I deal with it. MMO's are games with an extremely wide range of skill and it doesn't really bother me, however for a player that is flagged as being someone who will offer advice to new players - it deeply concerns me that someone of that skill level is a mentor, and I am not.
So my request is quite simple.
Adjust the minimum mentor requirement to include at least 100 days of "logged in" playtime, or number of instanced duties completed, or something along those lines - rather than a blanket requirement of "1 of each role at 60".
Levelling doesn't take long in this game, and there are many level 60 players on multiple jobs that don't have anywhere near the level of knowledge that should be required in order to give advice to new players - as these players are new themselves.
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Edit - I was mistaken, there is a minimum instances & commendations requirement but they seem rather low. (Shows how much interest I have taken to the "mentor" system).
A few other suggestions / points from the thread