Just watched Amityville 3D again yesterday after quite some time. It has to be one of the worst in the franchise. Hardly anything happens that makes you want to sit down and watch this again. I'd put it right down there with Amityville Curse.
I also watched Amityville Dollhouse a few days ago and thought it was pretty good. For a DTV release it had some great special effects. Definitely better than what I remember it being.