Over a staggered series of pandemic-delayed release dates, “Unhinged” has been consistently hyped as the film that will bring the dormant theatrical scene back to life — the one that, as other major releases have either postponed themselves into the distant whenever or bit the bullet and premiered online, has stuck to its guns as a summer big-screen experience. That’s no small amount of self-imposed pressure on a film that, on paper at least, doesn’t look all that prepossessing. An honestly trashy B-thriller that is by now less widely known by its title than as “you know, the Russell Crowe road rage movie,” it doesn’t exactly seem too momentous a film event for VOD.