Yeah, you might be disappointed if you want horror. It's got a very good rating (82% on Rotten Tomatoes), but some are criticising the fact it wasn't scary enough.
I just didn't see it that way at all and saw it more as a supernatural, psychological tale with just a touch of horror.
If horror fans are looking for a fix they may well be disappointed.
I liked it, but then I wasn't expecting a horror anyway.