grading people on their stats is unheathy
you always get someone in the game who refuses to end it so they can get a higher grade
you always get someone in the game who refuses to end it so they can get a higher grade
Except that's not how the grades work, and no one actually does that.
It grades you based off other players who have played that champion in that role.
KDA, CS, Wards, & Objectives (Dragons, Towers, Baron, ETC.) I think are all taken into account into comparing you against the other players of that champion/role combination to get your overall grade.