But if ___ is so op, why is their win rate low?

Let's think about Pyke, Akali, Riven, Yasuo, etc... people constantly complain about these champions being broken, and you guys are always telling me, "but their winrate blah blah blah". Look up selection bias. If you play Riven, you are more likely to be toxic, are more likely to be impulsive, and are more likely to hold the mentality that it is worth it to 1v5, because you might get a kill out of it, which would be an outplay!! And then you realize that these qualities make you much more likely to lose.