That is another factor as well as if you are playing against other gaming platforms.
I know in H1Z1 I pop helmets and get 3 or 4 hit markers and when I get killed the player I hit 5 times is at 100% health, lol. I used to get fairly mad until I figured out what was happening, now I am blah about it.
Haha, yeah, I know what you mean. It's the same in CS:GO too. You'll experience some minor lag with a "decent" computer, and even if you can't really notice it yourself that much, your opponent will have a slight advantage in every peek. Annoying as fu#k, but that's just how things are.