Supports as disadvantage with mastery system.
I've read how the mastery system is calculated, at least as much as Rito will tell us. The issue I'm seeing is that supports get low grades just about every time. I've won 9 game in a row and only has one single A. Even on a perfect game where I took the most damage and died 0 times I got a B...... So what gives Rito why are you punishing support for not getting tons of kills?