Starts with a great premise and atmosphere...
And then gets formulaic and in search of and a tidy ending, mostly failing. The autopsy build and atmosphere is quite good, and had me riveted.
Then it just sort of wandered around and went from original to the opposite. It's like they had 2/3rds of a great movie/premise, shot it, and then struggled to bring it to a close. Too bad. I'd give the first 2/3rds a 9 to 10 stars, last 1/3rd like a 5, so ends with a 7 or so.