Quality doesn't guarantee victories. For me, 2 most important factors are quality and form. My most useful MC in Celtic this season was 4* one with FK SA. Although he is the weakest MC according to quallity that I used this season, he scored 11 goals in 31 matches and his form was constantly good while other MC's were sold due to bad form (4-5-6...). I don't care how much stars he has until his goals win matches for me