I do not know why 18

The film is not as scary as you'd probably expect at a 18 share.
Comparable to other Exorzismusfilmen (eg The Exorcist or Exorcism of Emily Rose ..)
In the film, a Reverend by video camera is accompanied to a "exorcism", in which he wants to prove quasi that there are no demons and Co. He also does not believe. It is then actually already foreseeable that he encounters a real demon ...
There are some shock scenes, but not to compare with other films in this genre. The actors I found personally good.

On the whole, I found him Ok and also worth seeing, so I have to continue the same even looked at.

I personally think that the wakes from 18 released in many high expectations that are simply not met. This is reflected in the rating.