What was different this time? I've only seen the first two (from TV), and they were quite similar, fake home/surveillance videos of some family being harassed by ghosts. I admit they were somewhat scary, but in a cheap way. The same way like the first Resident Evil game was, with its "quiet corridor... until suddenly a few zombie dogs jump through the windows and attack you!". Cheap jump scares, which I don't quite appreciate the same way like, oh, Hellraiser 1 and 2 movies.
Was it this time a proper movie with a story, and not a quasi-documentary akin to The Blair Witch Project?
No, it was still mostly the same. The main problem, apart from the paper-thin characters and crappy dialogue, was that there was no build-up . It was going on like the others up to the point where it started being Poltergeist on steroids, with the ghost that harassed people in subtle, unexpected ways suddenly beating going Rambo on them.
Did I mention the cast sucked, apart from the daughter ?