Champion Mastery Scoring is Wrong
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2073716073/217208053?tab=overview&participant=8 This is a game my friends and I won. You may notice that the Miss Fortune, my girlfriend, did really well. Well she was given a B. A gosh darn B!? That is a damn good score to be just given a B! Okay, so maybe League's scoring system doesn't go off just raw score. But then there is the Kha'Zix, my good buddy. He went 13 and 10. He fed pretty hard that game. He was given an A. An A! What is this system? He tanked as much damage as I did on account of dieing so much! Sure he carried us damagewise late game, but that was not better than the Miss Fortune's 8/2.
TLDR: The scoring system makes no sense. We were baffled by it in the post game lobby. I think some changes are in order.