Even though this film is cheesey and uber-low budget, it's not too bad. Although many of the scenes are more than shades of The Exorcist, Omen, Carrie, and The Fury, there are some unique moments that gave me the shivers (such as the snake-and-rats scene and when Cathy appears and disappears before her mother on the steps). The low-budget, grainy film quality and super cheesey "score" are at the same time distracting and effective, and although the gore quotient is modest, it's gross fun when you get it. The editing and story are a little loose and sloppy at times, but not so much that you want to give up on the film. Sometimes, these weaknesses create an (I'm guessing) unintentional ambiguity that adds to the spooky fun.
In my world, haunted kids and (even more so) freaky-looking dolls are always the makings of a good horror film. This film has both in spades. I found it on Brentwood's "Possesion" 4-movie DVD set, which is a steal at $8. Don't expect winning performances or slick effects, but check it out if you want some good B horror movie fun.