The Amityville franchise has always been an "also ran." This movie really showcases why this series is largely ignored. While the idea of a haunted house with a disturbing legacy is a trope, this production is marred by far more weaknesses.
The cast is merely "ok." The characters are a bit of an odd mix of semi-obnoxious to bland. All-told, no character is engaging or memorable - and I'm including the house itself as a character! This movie rests on the laurels of previous history and films, as a kind of narrative shortcut. The dark past of the house is only casually referenced, so viewers are expected to see "the house" as a credible threat by virtue of the other films or folklore.
Once past the opening sequence, the film plods about. The majority of the early chills come from poorly executed jump scares; namely things falling off shelves. A few ghostly whispers are oddly explicit, the words are crystal clear, and just a bit too well-spoken. Rather than conveying vague suggestions or even indecipherable murmurs, the whispers deliver Scrabble-worthy vocabulary.
The special effects are laughable. I am usually quite forgiving of SFX that are restricted by a paltry budget. In the case of "Curse," the money was not well-spent. The ghostly presences are distractingly poorly depicted.
All told, this film is just incompetent. It's not able to build a necessary sense of dread or mystery about the House. The cast are uninteresting, and the chills are poorly executed all around. While the Amityville franchise has never been particularly strong, this entry is a straight-up waste of your time.