If you want consistently good matches in plat you need to team up and go in with a decent dps player.
Yeah plat matches can be one sided but if you just take one decent dps player in there with you then you will have a good game every time.
It's a team game, just find a decent team mate that can kill everyone and your all set for a decent game. If your going into plat solo you are just rolling the dice.
Here is a clip of someone I added to play with me at 2800, I dont know who he is I just see he could kill people so I added him, everytime he gets ult he will kill at least 3 people, anytime I play with this guy decent match every time. This is the sort of skill level you want want with you going into plat match.
You do this team up then decent match every time. easy fix.
This isn't a one off there is loads of guys like this going solo in plat that will happily team up with you and give you decent match every time.