When using the sniper turret, a laser is sent out to the target which you choose. This laser will penetrate through walls despite not allowing the actual turret too as well which is very confusing when you're trying to multi-task during a firefight, focusing on shooting your own gun and the turret's. Also, the turret laser moves very slowly when targeting a moving enemy but despite the laser not being caught up with them, you can still lands shots.
When reloading a gun, you can get half way through the reloading animation and then swap guns but the reload for the first gun will still complete itself despite not having finished the actual animation. I just feel that this could be exploited by players so that a light machine gun with something like an 8 second reload could be easily reduced possibly by half to continue their fight quicker. Having larger magazines and longer reload times are disadvantages chosen by players so by having a way to negate these disadvantages, it may limit customization of mods for some guns (for example).
Some enemies, such as grenadiers and medics, that have their critical spots on their sides or backs will sometimes poke through thin cover which allows you too easily take advantage of them and destroy their critical area without any difficulty. This just makes the game unpolished compared to the rest of the game.
(Will try and get the videos on here as soon as possible)