Mastery grading post-game has no real meaning if you don't know what it's compared to.
Couple games ago I manage to get a 12/4/9 as Karthus with 190 CS but it only gave me an A+. Now I get it, my CS could have been higher, BUT I still feel like it's sort of weird how we're being graded when we don't even know what the actual benchmark is so we can get better. I'm just asking, can we please get some sort of way to measure HOW we're being graded exactly?