Ranked is rigged

I main healer, almost every single game I have the highest heals out of everyone, sometimes the other healer has around the same heals as me.
Yet why do I still get put in a team that is below my skill level whilst the other team has everyone in the same level. The amount of times I have the same KO as the DPS.
Every single match there is large DPS difference, but when you see the bad player's history they are sometimes in the team with the highest DPS whilst the other team is nowhere near.
I am losing motivation to play because no matter how much I actually try, it doesn't mean anything.

And the amount of times the other team gets overtime without being in the area whilst my team doesn't or my team is stuck at 99% then the other team goes from 0 to 100.
I feels like I am wasting my time, as soon as the other team realises it is a guaranteed win they begin to be very nasty in chat, it feels like people can tell from the match at the beginning it is a guaranteed win based on what they see in other matches. Seeing bots are in quick play, who knows what the devs are doing to ranked too, this game is starting to rub me off the wrong way now after going up and down between gold and platinum as the cracks are starting to show. The thing is if you started playing rank earlier you are guaranteed to have reached grand master by now, if you started less than a week as solo because of the winrate, not possible. Clearly there is EOMM instead of SBMM so why does going down a rank even exist then instead of only tiers, why work up to platinum then finding out I can go down back to gold just defeats the purpose if it is just gambling a win. Ranked needs a rework or it's going continue to die. Won't be even surprised if a team's character stats are altered to increase the other team's winrate to reach 50/50.