I should have added that I found it to be a good level of scary. Because I'd wanted to watch a scary movie for Halloween, the boy decided that we should drive about an hour outside of the city to see this at a drive-in theatre. And, it really helped to ramp up the scary factor - certainly more than sitting in a comfy seat inside a building.
It helped to have shadows and sounds (creaks and gravel crunch and the wind) around the car. When Lucille was slashing at Edith through the bars, someone walked past the window on my side and I, irrationally, yelped a little because, you know, it could have been someone with a huge cleaver.