The champion mastery system is pretty stupid

Namely, I want to talk about the level 6 and 7 mastery...

Generally I find myself getting S-level masteries when I "smurf" with my bronze friends... It's not necessarily how good you are with the champion. That helps a lot, but it doesn't give you an S all the time. It's just stupid that if only so large of a percent of S-ranks are given out... it's pretty obvious that people who just smurf are going to get the majority of those S-ranks.

I'm not sure what riot was thinking with the significance of this rating system, but first of all, it's not possible to just determine really how good you were based on crunching numbers, and just to point out, as it currently stands, this mastery system places too much emphasis on cs, which is just a blatant reason why it's just inherently broken and cannot predict your skills. If I want an S, I just play with my bronze friends and take all the cs I can get. That's about all there is to it for me. It's an easily manipulable system, and riot thinks otherwise. That's the major issue I want to highlight.