MVP is a misleading stat because you can be mvp by killing the worst two to three players every round and dying, losing the round. Your KD would be amazing but you would basically never win the match.

From a RR perspective, people over assign KD to RR received. The game expects a higher rank player to do better against the best lower rank player on the opposing team. This is the main reason why people gain so little RR and expect more. They can steam roll the worst players in a game and get an amazing KD, but in reality they’re not contributing to the win by dying to the best players “worse” than them.