Grade Guidelines?
As I understand it, the ranking you get from a game (S, A, B+ etc) is based off some calculation involving the champion and which role you play with that champion, and then average k/d/a etc of other players who played the same champion/role combination. Like for instance, I know full well I have a MUCH better chance at getting an "S" rank with Poppy as support as I do as playing her top. (Got Poppy to rank 6 doing just that). My question is there a website or something somewhere that gives players a rough estimate of what they SHOULD be getting in terms of k/d/a etc per each champion/role selection for each ranking? For example, I just played a game with Maokai as support and went 3/0/19 but got A+. I'd like to know what other players of Maokai/Support have gotten to get an "S" or better. Does such a resource exist?