I wouldn’t say that mirrors are particularly overused in horror films, though they have certainly featured. I recall a pretty run-of-the-mill film with Kiefer Sutherland a few years back, imaginatively titled “Mirrors”. This offering does a little better, lumping for the generalist “Oculus”. It wins bonus points, though, by not going for the tired cliche of “a mirror, darkly”, or any variations thereupon.
Actually, my first thought upon seeing the trailer for Oculus was of The Quiet Ones. Which isn’t a particularly auspicious start for a film. But there is entertainment in even a bad horror film, so off we popped to the cinema.