How bad is it? It's the least bad of Ulli Lommel's serial killer movies, so it might be the third worst movie ever made.
Should you see it? God no.
I really can't say how glad I am to be done with Lommel's serial killer films. This one is about the real-life killer of four dozen prostitutes in the Seattle/Tacoma area. It tries to look a bit like a documentary, but it has a lot of made up filler, including new characters like "Boris" that never existed. Shot somewhat better than most low budget films, it has no plot or acting, just shots of masturbation, then a killing, then a topless woman, then two more killings (with some footage repeated)... and then a total of 88 minutes of pointless kill, kill, kill with no real exposition. The one very minor laugh to be had is the fake street sign reading "Green River."