It’s honestly not that bad.
I'm not a huge fan of Insidious, but I had fun watching Insidious: Chapter 2. Rose Byrne and Barbara Hershey both give pretty great performances. I enjoyed watching them, and the rest of the cast has some good--if not better--moments on screen. I don't like some of the choices made by the filmmakers from a technical aspect, but if you liked the first film, I don't see any reason why you shouldn't want to see this sequel.