a lot of that is a function of the matchmaking system. Your MMR (matchmaking rating) goes up or down only based on win/loss, not any characteristics of how you played that game. If you do phenomenally well but your teammates are terrible and your team loses, you lose the same amount of rank they do. The idea that the culture of a game is influenced by the rules of the game is explored in Nick Yee’s book “The Proteus Paradox”.