Add average rating to Champion Mastery.

E.g.

Draven Champion Mastery Level: 5 Average Rating (Win): A+ Average Rating (Loss): B- Average Rating: A

Anybody can spam a champion indefinitely and get hundreds of thousands of Mastery Points. Champion Mastery, as it currently exists, merely shows that someone plays a certain champion a lot. Meanwhile, the formula for Rating your performance in a given match actually seems to be fairly complex in that it takes into account kill participation, damage dealt to champions, farm, healing. I believe it even takes into account the nature of the role to some extent. Yet two Draven mains with 100k Mastery Points (one that consistently makes huge contributions to a game, and one that sits there and goes through the motions and isn't a consistent player and doesn't make any meaningful contributions) cannot be distinguished from one another at a glance.

Right now, the Mastery system just seems to serve the entitled people who wanted freebies because they played the same two champions every game.