Grading System

Dear Riot Games,

I feel that your grading is complete bologna. I played a game as Jihn (inb4 he's a crap champ) and I went 27/5/14. I received an A+ performance on this champ. I have seen much much much worse get S+ and since the new hextech crafting system is based off people achieving S's in matches, I would like to know the formula on how the grading system works. I have never gone 27/5/14 on Jihn and I probably never will ever again. This is not the first instance in which I have been screwed over by the grading system and have been denied an "S" when I feel that I should have.

Sincerly,

A player who likes to feed his ego.