I found the movie very disturbing and unrealistic . How can the doorman and his friends not notice the trail of blood in the lobby or on the sidewalk after Bateman kills his friend with the axe. In addition, if anyone killed 4 cops in one night their would be a massive police response to catch the perp.
It was even more disturbing when the character killed the homeless man and dog in the alley.At this point I almost turned the movie off.
On a positive note, Christian Bale plays a great pyscho. In fact, I'm not sure if he was really acting much to get into character.