If you check my other reviews I go back a number of years and no one owns me, this is a real review by a horror fan.
The 10's are likely fakes. Movie is not a 10. Its not a 0 either. And better than average.
Every time I see an exorcism movie advertised I roll my eyes. I am 54, and have seen them all from the Exorcist own down. I often pass by the long stairs in Georgetown where the priest in that movie appeared and death happened.
But. This movie brings several fresh things to the table. I won't spoil any, better if you see them with no clue. Know that they are very original and never seen before. My teenage girls and wife were screaming often, and they do not scare easy. They are seasoned horror fans.
If you are a fan of horror, if you like to be scared, if you like earned jump scares, this is for you. The acting is really really good, the special effects are also well done. There is a lot of heart and they have done the max with the budget they had. If you are a horror fan, you will be fine.
There are some sexual topics in the movie that may not be suitable for younger viewers. It is rated R for a reason. Mainly the sexual aspects. All told, the sum total of all scenes with sexual tones are less than 10 minutes. It is not over used. But it is there, including some explicit language. Personally, I would say for teens ages 15 and up. The more up the better. My teenage daughters made ME close my eyes twice. Seriously.
The plot has not been done before, that is new too. One of the types of exorcism has NEVER been done before in any movie, ever. Was a fun twist.
Hopefully there will be a part 2. Movie alludes to it, but no worries, the movie stands on its own.
Enjoy.