Grading System should take into account your team's performance.

Suggestion: The grading system should take into account how well your team performs when it gives you your grade.

For example, I was just in a game where we got rolled hard and I had Jhin. I carried the team, although we eventually lost, and the game would have ended at least 10 minutes earlier if not for my strong play (for example, I got two triple kills and multiple double kills). At the end of the match I had half the kills on my team and did 40,000 damage to champions, while second place on team did 16,000 damage to champions and the others did 10,000 or less (my deaths were also not high relative to the rest of the team). My other team members had champions that can do damage, like Master Yi, Kallista, and Garen, but they were unable to do so for whatever reason (I did not criticize them for this, everyone has a bad match sometimes). It's ridiculous that I get a grade of D+ in a game like that, when probably everyone in the match could agree that I was the most formidable champion on map (I also did more damage to champions than anyone in the other team, btw, even though they got more than 2x as many kills as us). As I understand the system now, it compares how well you do compared to others who played your champion with the same team comp and against the same team comp you are facing. But it should also take into account how well your own team performs in that particular match, because if your teammates perform poorly it objectively diminishes how well it is possible for you to perform. A player that plays well and carries a weak team, even if the team eventually loses, should not get a terrible grade. I'm not saying give them S+, because winning counts for a lot and is the most important thing, but they shouldn't get D+ either if they actually played their champion really well.

If you are in a team and two of your teammates feed hard, for example, that should be taken into account when you get graded. As it is now, getting S grade is usually down to having a team that overall steamrolls the competition, when it is supposed to be about your individual performance in the match, not your team's performance.

I hesitate to say it should work the other way too, because certainly S grades are hard enough to get already and should not be made harder, but it is also true that if you are on a team that is just obliterating your opponents it is MUCH easier to get an S grade than normal and does not necessarily reflect that you really played your champion well.