I hadn't seen the film prior to the riff. It wasn't nearly as grisly or demented as I anticipated. Seemed kind of tame to me, actually.
Oh, and it sucks. Elwes' performance in the last twenty minutes of the movie is astonishingly bad.
The Rifftrax is hilarious. One of the best, possibly because Kevin and Bill are so uninhibited. They do a good job of keeping it silly, even when the movie tries its darnedest to be disturbing.