You think it's too easy to get head shots in Overwatch? You might be onto something if you check out this video by Force Gaming. They discovered that the hitbox detection is crazy off when it comes to registering ranged weapons. This makes it possible to headshot someone when your cursor is a full mark above your opponents head, or even able to headshot someone behind a wall just by hitting the doorway near them!
Probably something that needs to be worked on when competitive play becomes a serious endeavor...check it out.