I saw it midweek expecting something greater than the sum of its parts but found it to be less than any one of them. So, as a film, I currently only give it 5/10; however, it seems that I am in the minority - maybe I'll mellow, given time.
But, as a horror film, it's about the same as The Evil Dead (OTT physical effects, not much in the way of shocks) which would probably make it an 8 on your scale (judging by the wording of your question).
p.s. Evil Dead I and II are amongst my favourite films but I wouldn't call them particularly scary.



