Out of 0-10 what would you rate it?

An ABSOLUTE 10/10!

For my taste, I would say a 6.5

It's a professionally made film and well acted, but not something I feel compelled to rewatch unless someone's playing it around Halloween.

It's very cold, almost sterile. The book is the same way.
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10!

(and it isn't even on imdb's top 250)

10 out of 10

10/10

9/10

Solid 10 and I only have a few worthy of that score!

Sure, why not give it a 10. Has some pretty disturbing scenes. I always wished they showed more of Regan playing with the Ouija Board though, I was fascinated by them when I was a kid.