First off, I'm just going to assume you've seen the first one. If you haven't and you want to see this one, rent the first. It's not like it's extremely necessary, but this one will make more sense if you have.
The story of this movie takes place a little before the first movie, and a little after. Thanks to titles that pop up on the screen, you'll have an easy time figuring out how things fit together. I don't want to give too much away, but basically, this story involves a family who, just like the couple in the first movie, are haunted by some sort of demon. Lots of craziness happens....and like the first movie, lots of nothingness happens.
Overall, I liked the movie...I'll just say that. It's a movie that's kind of fun to get in to. So if you liked the first movie at all, you'll enjoy this one.
Now, here's my problems with it.
1. It's too similar to the first movie. Everything starts off happy, then slowly gets creepy, then gets insane by the end. Much too similar.
2. There are several times in the movie where it leaves you saying, "that is NOT what a person in this situation would do!!"
3. While I like how creepy the movie is, it still just relies on jumpy moments to scare you. This is NOT true suspense. Here is an example: Remember watching the movie "The Ring"? (My favorite scary movie by the way) Think of the scene where the main character returns to the creepy dad's barn/house and sneaks in at night. The house is dark and the lighthouse light keeps shining in. Then she finds the tape of crazy Samara in the nut house? Remember how scary that scene was? It's scary b/c the whole time you're thinking, "Get out of that house!!" It was scary b/c you can imagine yourself there.
That is true horror. This movie isn't like that. You may be scared, but you're only scared b/c you're waiting for the next [Extremely loud] jump out scene. Make sense?
Anyways, overall, I liked it. There was one scene that made us all want to pee, so I think you'll like this movie.