Thought it was pretty good for modern horror, except the lame exorcism.
It wasn't bad...I just didn't find it compelling either. The character development on the mother was weak. Too many children made it hard to relate to any one child in the movie.
The protagonists (the clairvoyant and her husband) were likable, but not engaging or enthralling.
The husband of the wife who was possessed seemed more milquetoast than anything, but I suppose it's hard to have two strong male leads in a movie.
And then they didn't dive deep enough into the back story on the reason for "demonic possession" on the property. It glazed over that too quickly, in my mind.
And yes, the Hollywood ending to the exorcism was a little saccharin. But I expected that, and Hollywood did not disappoint.
There are far worse horror movies out there, to be sure. It could have been far worse.
I guess I just expected better, based on internet hype about the flick.