+25 points = 5 stars, great player, well liked in the majority of dungeons, only ever groups with players at 3 stars or higher.
24-10 points = 4 Stars, good player, inexperienced and liked, groups with anyone 2 stars or higher
9-0 Points = 3 Stars, average/new player, may have issues with communication, behaviour, generally a solid party member but not a constant nice/high performer. Groups with 2 stars or higher.
0- -5 points = 2 Stars, a poor quality player that isn't felt to be nice or helpful and taking the darker path of gameplay. Cannot group with 5 star players.
-6 or less points = 1 star, cannot group with players other than 2 stars. Trolls, intentional Wiping, harassment and bad play. Generally bracketed away from "normal" players and longer queue times.