I don't know, try to compare them, for exemple I have 2 strikers, one is quality 60 (6 stars) and second one is 62 if I am not wrong (6 stars+), one have 7 goals in 16 games and an other one have 11 goals in 17 thats 0... also I'm counting the games from CUP when I played against team who was lower levels then me.