I caught this last night, and surprise, surprise, I loved it. I'm not much of a Wan fan. If not for Rose Byrne being in this, I likely would have waited to see it on Blu-ray.
I was very impressed with the level of atmosphere and tension on display. The film is genuinely unsettling. I also thought the idea behind what the haunting actually is was most intriguing, a creative detour from the norm. Everything with Lin Shaye and her crew is gold. They come in midway through and pretty much steal the movie.
One major plot point is predictable and I didn't much care for a bizarre scene with
the demon in his little workshop,
worked for me as a whole. It's a step in the right direction for Wan, and I'm glad I made a trip to the theater for it.