If there was ever a horror movie that could be called the cinematic equivalent of fast food, "Lights Out" would be a fat, juicy cheeseburger. You savor every delicious morsel as you consume it, but afterwards you're self conscious about what you just allowed into your body.
"The Shallows" seems to be an attempt to forge a marriage between critic friendly drama ("Open Water"?) and plebeian friendly entertainment ("Shark Night"?), although the relationship ends up being somewhat turbulent, if passionate.
I had liked "Lady Snowblood" during my initial viewing, but I think I only enjoyed it on a superficial level, believing it to be exploitation packaged as art. I was paying so much attention to the violence, sex and style that I overlooked the depth to be found within the story, characters and visuals.