Dude, the problem is that you die too fucking easy, there is no cover system you can use, only los behind walls, and there is no tactic to this game. Did you know the game actually has a Crouch? Have you ever used it or seen anyone crouching behind some boxes to use cover? NO! Everything happens so fucking fast that it's pointless to use such mechanics.
And even if you would want to use cover, there are so many stupid heroes like Pharrah and Junkrat that can just kill you even behind cover, that's pointless to use it.
This game is a mumbo jumbo of rushed combat more similar to Quake and Unreal Tournament than to Counterstrike or CoD, and people...well...they're fucking playing it like it's Quake.
Even Blizzard doesn't know what they wanted to do here.