I found that if the player costs extremely high (compared to the other ones) and his season wage is extremely high too then he is a bad player. Ah, forgot to say that very often players with height <180 plays like **** for me. I've got player worth 13M and his quality 46- sold him after his bad play. For avoiding this l'm buying players that
1)costs high and his season wage is low compared to the other ones.
2)height must be over 180.