Disappointing.
All the hype, the box office success, the weeks of waiting and that's it?
Aesthetically the movie is strong. Some nice photography choices, decent editing and the atmosphere at times was good.
The acting was fine I guess but I saw people discuss why Lee Harker (Maika Monroe) was so... flat and awkward. Some online speculated if she was meant to be autistic or something, I can see why. I've seen Maika in other roles so I know that's not how she normally comes across. You do learn a bit about her character which could explain why they wanted her to seem a bit odd but still I didn't find her that likable or engaging as a protagonist.
Nicolas Cage... I'm not a hater of his but by God did he ham it up here. I'm not sure his take on the character of Longlegs was the right choice... nor the chalk white makeup look. A silly weirdo of a villain.
The mystery was done quite well but the movie lacked scares, gore, nudity, all those scintillating aspects of R rated horror movies. The tension was even under cooked.
Basically the movie looks nice and has some mystery to it. Most everything else falls flat.