hard pass.
despite your thinking it will improve performance, it wont. people who try hard but are missing mechanics and things, will get an F and that leads to frustration.
people who do little, and somehow manage to do the minimal required get a better "grade" and feel no need to improve.
people do not want a computer evaluating player reports, and yet you figure that somehow, a "grading system" based on job performance based on more than a few variables will be accepted?

the mentor system has issues as it stands, the mentor system needs the change, such as removing the rewards

I DO agree that if someone has left a dungeon, and you think they did well, you should be able to still commend them, but I also think people shouldnt rush out like their house is on fire (unless of course it is)

you have so many suggestion which would lead to this being a completely different game. One has to wonder if you really enjoy this one....