Let Us Prey 
Although not any small component of Brian O'Malley's feature length debut, Let Us Prey, is Earth shatteringly great, it's a complete and genuinely satisfying package of gore and blood, gripping tension, interesting story and capable cast.
In a town where it seems every criminal, citizen and police officer is a murderer, a Grim Reaper-like figure arrives to ensure "that the price of our sins is paid for in blood". A first day on the job officer is left to piece together the mystery of the entity and the darkest secrets of everyone in the station.
Possibly describable as Assault On Precinct 13 (1976) where the terror is actually inside the police station, Let Us Prey was a treat to watch. O'Malley knows how to build the characters, pace the story, and put the foot down on the gas pedal when necessary; not to mention how to deliver some truly epic level kills.
Despite all of the entertainment value of Let Us Prey, it's a shallow pool of water. There is little to no originality, and nothing presented or hinted at outside of the narrative. But sometimes that's all a horror film needs to be, entertaining. So if you can shut your brain off, handle a healthy dose of violent death, and swallow a truly absurd ending Let Us Prey is totally worth spending an hour and a half on.