I won't go too in depth on the plot of the movie, since quite a few have already done so in these reviews. This movie had a few interesting ideas that I personally haven't encountered too often. However I found the movie's story writing to be very sloppy.
There wasn't much to figure as a viewer, so a lot of the suspense was lost. You could tell the jumpscares we're coming a mile away. They spent no time developing the characters, so you didn't care when anything happens to them. For me personally, by the time I learned their name, they were gone.
If I had to describe this movie in two words it would sloppy and, most importantly, BORING. Seems as though Netflix is no longer concerned with the quality of their own content. Big surprise.