It amazes me this movie gets hate
Insidious is one of the only quality horror movies that has come out in the past decade besides The Conjuring. Yeah, it's unoriginal, but every horror movie is! This one has a very interesting story and has plenty of scares; it also doesn't rely on blood or gore.
I also have to disagree with the hate for the second half of the movie - it reminded me a lot of Poltergeist. I liked the whole search for the kid part. People are so critical of everything these days. If this had come out in the 80s, I guarantee it would be regarded as a classic - it is for me now.