I know this may seem minor but it drives me nuts.
If I fire my gun at someone and miss thats understandable, it happens in real life as well as the game. The part that drives me crazy is when I fire the gun, i miss and the projectile flies out of my gun in the total opposite direction of my taget. Not only is that impossible it is very goofy looking. Cant you make it so the projectile flies towards my target but pass him when its a miss.