Can't speak competitively, but it certainly seems to make pubbing a lot less obnoxious, you can't just run around murdering people anymore, you actually have to snipe and hit headshots. A lot of classes can now challenge widow and force the player to hit headshots in order to win, kind of like sniper in TF2. The changes don't seem drastic but they certainly help. I actually like nerfs like this, Blizzard has a history of over nerfing things into non-existence.