When it is executed by a little girl, it changes the scene a bit. I haven't seen Rambo 4 either, but I've heard that the violence is not very realistic in those movies (I've only seen First Blood). Kick-Ass is presenting the setting like it could really happen and the guys to be killed are thought of as real people instead of just random thugs. I think its horrible, ending someones life like in the movies and often seemingly enjoying it. By a little girl. I felt really bad every time someone was killed in the movie.