You're just more accustomed to traditional FPS of point click shoot. You either miss or you don't. CS:GO would be more of what you're looking for.
All I'll say is yes lots of abilities/gun mechanics in this game are pretty forgiving and with reason as Blizz wants the game to have mass appeal but mastering the game is rewarding and you'll always outclass somebody that just fires in a general direction. Take Junkrat for example. Yes if you keep lobbing grenades in a direction they'll eventually hit but then you have players who understand the weapon well and can actually purposely aim the grenades and hit the majority of them.