I understand where you come from and being a GM myself I agree to that there needs to be a method of filtering unwanted players. However, for suggestions like this to pass you would need to show a feasible answer to the following questions/situations: Who would be able to vote for whom? (Only those that have been in the same game within x amount of days, etc.) How are new gamers supposed to gain reputation? What are you going to do with buddies that rate each other up? (This is a thing in reddit too!) How would you estimate the comment/rating was correct? (What stops someone from giving you a permanent "Troll" mark?) These are off the top of my head. And even if they had a very minor impact, it will not change the overall ratio. While everyone can agree to leavers being bad players, power gamers are only subjective. It might come a bit strange to you but I allow min-maxers as that is also a form of playing the game. Nothing has stopped those players from being excellent roleplayers and having in-depth character development. I digress but my point is that we could start an argument as to what degree of power gaming is allowed or not because it is a purely subjective matter. What stops others from rating others based on their own sense of morality or point of view, etc? Sorry to burst your bubble but this causes more trouble than anything, unless you find an objectively good methodology for rating people that does not allow room for subjective misbehavior. If you do manage to formulate something like this you will not only have my vote but the vote of other colleagues of mine and all of the GMs that are plagued by unpleasant players.
