The reason this movie is rated higher than the other 2, is because it took what made the other 2 good and developed it, and because it abstained from what made the other 2 not so good. For me, it could've been a little longer, perhaps have a more lasting climax like paranormal activity 2, but it id definitely worth watching. Perhaps a little more interaction with the "demon" could've helped. There are some scenes though, that are excellently crafted, such as the "bloody mary", and the "everything falls from the roof" scene. The nanny scene is worth it too and honestly, at least these movies are actually thrillers, not bloody, disgusting frames that are pointless.