Each rank is what it is amidst these issues. People in top 500 got there amidst leavers, bad teammates, and trolls. Dafran didn’t have 3 accounts in the 1, 3, and 4 spots by accident. He got there by playing well all the time.
There’s been plenty of games I’m getting grav faster than our hanzo gets dragons, gold damage as Sombra when we have a Pharah, 70 elims as tracer when our mccree has 38. I have a few accounts and my season high is generally no more than 50-100 apart. On a 5,000 point scale, I’d say a system that gets you within 1-2% consistently is working as intended.