Diabolical is insanely dull. It portrays so many haunting stereotypes in alarmingly uninteresting ways. The focus on drama is appreciated, although it dawdles needlessly for half the runtime, and even then it falters with lackluster attempt in horror and poor design for the creature. At the end it tries to pull off a nifty twist, but unfortunately audience would already be disenchanted by the clumsy execution.
An entity binds a single mother and her two children to a particular house. What follows is average haunting gimmick which other movies have done better. It often stays too long on certain scene or abruptly changes tone with several supporting characters, either ways it doesn't pay off in the slightest.
Ali Larter as the mother does a decent job on creating some family drama, however the tired theme of single mother struggling grows old too fast. She faces mortgage issue, visits from social services and even bullied by strange entities. It becomes mundane later on, not to mention the other characters seem like extras without much personality and the things they do sometimes defy logic as they wander aimlessly.
All of those flaws can be forgiven, as most horror tend to skimp on narrative, but The Diabolical is simply not frightening. Practical effect is poorly done and the special effect looks awfully fake. The design for creature might be decent for the first or second time it appears, but this is the case of not showing too much can be more effective, which doesn't help much since the movie can't set up any suspense regardless.
The effort to create drama is decent, but it soon becomes repetitive and tedious, especially when the movie can't deliver any horror, thrill or even the slightest tension.
