I find it interesting how you talk about how easy it is to become a mentor while also talking about how undesirable you apparently find it to level a DPS and Healer job to 60 in the same post, when every single "bad" mentor somehow managed to do it.
The mentor system isn't about being an absolute master of every aspect of the game, it's about having enough experience and willingness to help new players find their footing in the game. I'm not condoning rage quitters, but if you're going to try to criticize the ones that try to stick it out but perhaps aren't as skilled or knowledgeable about certain Primal EX fights or raids, you may want to at least get a Healer and a DPS job to 60 so you don't come across as a hypocrite. (Again, seeing as how all those bad, rage quitting mentors managed to do it...)