The "performance" based ratings is shit and I've noticed that it doesn't take into account performance at all. I've been checking my teammate trackers out of curiosity and what I've noticed is that it's way too biased towards assists so support players that play assist hogs like cnd, rocket, jeff benefit way more from the system even if they aren't doing anything or are the reason you lost and keep climbing higher meanwhile good dps or tank players are punished with a 20-24 point loss or more while also having to work twice as hard to gain and maintain points. You can even abuse this with heroes from other roles that farm free assists without doing anything like thing or storm