Finally someone made this thread. Laziness truly pays off!
Widowmaker is balanced with consoles in mind, that's the main issue. Blizzard already stated that they will balance consoles and the PC version differently so we can expect her to be tweaked eventually. Right now she can shut down an entire team as long as she's protected. Her only legit counter is another widowmaker, which makes pro matches stale as fuck.
McCree is already going to get a nerf soon. D.Va is going to get a buff but Blizzard still doesn't know what to buff exactly so it's going to take some time.
Also my character playtime pretty much reflects the best and worst Overwatch girl
Spoiler, click to toggle visibilty