Please riot rethink or revamp the grading for masteries or put up a better system. Please!
We're struggling on a 4 v 5 we kill 4 of their team mates finally take mid tower and me and our adc rush to baron to kill it, our yasuo was alive and instead of helping us he goes ham on their remaining vayne and takes a while to kill her but by the time he kills her he runs to us with the rest of the enemy team they flash in and go ham on us we have no choice but to back out and run for it they manage to kill us in the chase and take baron. Ofcourse that was the icing on the cake for our struggling team. All he cared was for kills and i feel he cost us our chance, so the match ends and he get's an S- and tells me " see this eve". He will remain playing this way...