The thing is, if a person has good knowledge of the subject of the movie, you almost have to shut off that part of your brain in order to enjoy the movie. I struggle with military movies, and shoot-em up scenes in other movies, and it all started with the movie Platoon. I was enjoying it up until they had a scene shot from the front of an M-60 machine gun, my assigned weapon at the time. You could clearly see the red dots in the blanks, it just ruined the rest of it for me. They could have easily filmed it from the oblique, or at a live fire range with an unmanned camera and kept the scene, but no, they let it slide on through. Many of these type of movies, and I am sure many other genres as well, hire experts to help with the realism, but some junk gets through, and now there is a whole sector of people looking for and exposing the flaws in many of the large blockbusters.