I feel like the group I play with has definitely reached a fairly high MMR level, because there are McCrees EVERYWHERE. I've been playing him myself and feel like a total scumbag for it, but he's pretty fun. Fan the hammer combo is brainless, so I don't really mind that it's going to (probably) get nerfed. I will be perfectly happy just pistol dueling all day. It's so satisfying when you land a couple of good shots at mid range and completely shut someone down.
I also was completely losing my shit trying to hook a Tracer as Roadhog last night. I kept landing successful hooks, but she never ended up in front of me, so she'd recall before I could land a clean hit. Really frustrating stuff. I hope at some point Blizzard updates the hook and makes it actually deposit your enemy in front of you. It's even weirder with Genji, who sometimes ends up behind you because he tried to dash as you landed the hook.