I personally enjoyed it. The cinematography alone was very strong and well done and did a good job creating a dreary, creepy feeling throughout the entire movie. That's what made it so good IMO. Not any overall scares, but the overall dark feeling the visuals created from start to finish.
I keep noticing that MOST of the people who post that they were not impressed by it also saw it at home rather than at the theater. I'm sure a few will jump up and say otherwise, but generally speaking that trend has held true on this forum and other forums I hang out at. Not that the home theater experience is lacking - far from it actually with some of the monstrous home theater system specs I've seen listed here. But I keep coming back to a research study I read for one of our clients several years ago on why movies generally get less favorable reviews when watched from home rather than when they're watched in a theater. For the vast majority of people the entire state of mind is in a different mode when you go out to watch a movie in a theater as opposed to when you stay in to watch a movie at home. When people go out they're making a conscious effort to actively seek entertainment - they want to be entertained and generally look upon entertainment options more favorably in the hopes of being entertained. When people stay in, they're making a conscious decision to keep things closer to the vest and closer to home where they feel more comfortable; as a result they're more passively seeking to be entertained. An example cited in the study discussed how most people would usually laugh out loud at a standup comedy routine seen in person, but would usually not laugh near as much at the same routine if seen on a TV in their home. Add to the equation the hype this received from people who saw it in the movies which makes it even more difficult to live up to for the DVD viewers and it's pretty much a foregone conclusion that the movie will receive much weaker reviews from the most recent viewers.