Apart from myself and demonhunter I only know of one forumite who plays Overwatch regularly but I don't know his name on the forums, or if he still uses them.
I play with @SupportMeSunny a lot, but he's even worse than me. I'm scraping my way in diamond (literally landed on 3000 the first time, and the second time it was 3001. Currently at 3017 I think) he's barely Gold. Just about 2.1k. But to be fair I've had the game a lot longer. I'm level 300-something, he's 60 something.