Time Out says
First-time director Shane Acker’s major problem is one of tone: with its desolate landscapes, disturbing imagery and oppressive atmosphere of impending violence, ‘9’ is supposedly intended for adults. And yet the script is so shallow and bluntly allegorical, the characters so whimsical and transparent that even young teenagers may find it faintly patronising. The animation is stylistically impressive, but Acker’s restricted colour palette, with its washes of grey, green and brown, soon becomes a chore. An impressive voice cast struggle to inject life into the proceedings: Christopher Plummer is wonderfully obsequious as Petty Overlord 1, but Elijah Wood is merely flat and anonymous as the heroic 9. This film will surely be remembered as an intriguing failure: a triumph of ambition over ability, of ideas over emotional resonance – just another grim fairy tale for these troubled times.