This movie was downright awful, and even the 3D gimmick didn't save it. There were only a few scenes where the 3D effect was sort of neat, but if you saw the regular format of the movie, you wouldn't be missing anything. Save your money and skip the 3D listings, or better yet, don't go see the movie at all.
When you finally get to the payoff of the movie and you find out who the killer is, the movie then flashes back to each scene you saw previously, to show how it really was that person. It makes zero sense because they change the outcomes of the scenes.
Stupid ending and horrible acting, but sadly this movie will make tons because of the gimmick.