The players can rate each other based on the behavior on the Battleground. This is the Karma System. At the end of the battle when the statistics are visible, a and button appear beside the players’ name. You can rate the other players’ performance by them. The rating (-1/+1) will be added to the player's karma. The players with bad karma will start with a disadvantage, e.g., they will get fewer Battle Points at the end of the battle.
After every battle the players can rate their companions. The positive values mean good karma, the negative values are the bad karma. The Karma Points affect the players’ Battleground Points. If somebody has too bad or too good karma (<-100 or >+100), on the loading screen their name will be colored with different colors that everybody can see what will wait for him/her in the battle.