I think it might go on time played quite a lot as well as kd etc. I have a stupid amount of hours in the game I literally can't play solo anymore due to the terrible lobbies I get put in. Everyone camps every sniper lane. Doors are always hard scoped. It lags like mad. I play people in Russia, Brazil etc. If I team up with a friend its totally different. Like the way it used to be. It's really frustrating