Why is my aim so trash sometimes?

If you play for more then an hour on console your hardware is fried and the framedrops are FUBAR, leading to very inconsistant aim and stuttering. Also a lot of times there is a lag envolved on top of that. When they put a full clip in you but you only fire  2 bullets, while on your screen he wasn't even firing yet, then that's definitly lag. With bad ping your bullets would only fly out 200ms later, wich is a huge delay if you wouldactually see it. So they hide that behind their modern game's anti-lag methods so everything looks normal clienside, and when you hit the person on your screen it gets sent to the server who then processes it. So assuming you both fire at eachother at the same time but enemy has great ping and you have bad ping. You will be allready dead before you finished shooting your clip. That's also why sometimes you get the feeling you get shot trough doors or when ur allready behind the corner.