Better evaluation of "grades" given after ARAM matches

Getting an S on a damage character is nearly impossible in ARAM. Had a game where I did 88k damage (2nd highest was 50k), was 20/8/38, highest KP in the game, got a quadra kill, and had 2000 gold more than the next highest: riot gave me an A-. Other times I have played a tank like maokai and gone 4/5/20 and gotten an S+.
Report as:
Offensive Spam Harassment Incorrect Board