OK folks, I sympathize with those of you who hated this movie. It's nasty and what there is of a plot is goofy. But Nicholas Worth scares the hell out of me every time I watch this. At once smug and terrified, forceful and helpless, his whimpering panic-attack-tantrum gets right into my guts and makes me identify with this obscene morbid beefy creature.
The movie lets you learn just enough about the victims to experience their fear and pain with maximum possible sympathy and intensity, and the sarcastic detective and other incidental characters get some hilarious lines.
If you accept the goal of the movie, which is, to horrify you the viewer by forcing you to feel intimate with this infantile, onanistic killer, I bet you will admit that this movie succeeds.