Eli Hayes’s review published on Letterboxd:
Goddamn. The writing, the direction, the performances, the action & cinematography(!), the editing, the score; holy shit. This is easily the best thing that Leigh Whannell has ever been a part of - better than Saw, better than the very undervalued Dead Silence, even better than Insidious... all three of which I'm a big fan. One of the darkest and most nihilistic films I've seen in some time (fuck, that ending). The formal precision and emotional weight elevate it above its more pulpy, b-aspects, into a poignantly complex and morally intricate piece of cinematic cynicism.