Fix the Rating system

So this has happened in a few games but it only just now actually upset me. The rating system on your "gameplay" like the S or A ratings on how you played that game are really wrong. I just played a ranked game and the 1 person who lost us the game is the one who got an S rating because his cs was high for split pushing as Malphite. Which if you play League of Legends you know that Malph isn't a split pusher and even though he didnt get any towers and we kept telling him to join us in teamfights he insisted on split pushing and then we lost the whole game because the enemy team could 5v4 us and then go kill Malph after since he pushed so slowly. But then after the game he still got the only S on the team.