I remember Dota2 (video game) did this, people fake reporting had less reports and they counted for less, while people that were consistently reported players that got punished got more reporting power. Only one report per match "counted" too so a group of player couldn't gang on reports on one player.

Of course that could be abused as well,but you'd have to make a group of people that first got the good rating then reported same people and that would be significantly harder