The answer is the server browser. Several of us have independent servers, of which none are being used because of this asinine matchmaking nonsense. If you find some public servers you like, and keep going to them, admins will solve the bullshit problems. Which is what we should be focused on. As for now a bunch of bought servers for no reason.
This has been hapenning since the original test on this map in Alpha. This particular spot (room) will go dark. I had to use an explosive to make it bright. Not sure what the deal is but worth fixing. Map is Precinct. This screenshot is before it goes totally dark. Starts out brighter than this image but ends in near total blackness.
I like competitive with a party, allows us to practice with some actual consequence or skin in the game. As for someone being a diamond player I am unsure how you can know what ranking they are. I am 35 in game as I play mostly noncompetitive. I however only just finished my placement matches and am gold 3.