If you're not sure what a closet cheater is here is a good definition I found from urban dictionary:

Basically, it's when a cheater who uses any third-party software to get an advantage on a game, but instead of blatantly cheating, they will try to completely hide the fact that they're cheating.

I believe there are a bunch of players that are using really good, believable cheats right now, and climbing ranks, dropping 30-40 kills a game. Right now, without replays it is VERY VERY hard to tell if someone is cheating or smurfing. From your own POV it is almost impossible because you aren't seeing the enemy's crosshair movement or anything else. I really hope we get a replay system soon because the amount of fishy players I have been running into in Plat has been out of control.