Player clips into valls, fences, doors, the environment.

Player weapon should either rise up ( red orchestra 2 ) when walking too close to a wall, it should NOT poke through on the other side. Same with doors.

Player legs, same thing. You should NOT be able to lie so close to a wall your legs poke out the other end.

Player clips when vaulting. Every time, everything, you melt into the object you are vaulting over.

All points shown wreck the immersion in the game, if there was any in the first place.