Even though Michael Fassbender spends most of this film with his own head stuck in a polystyrene one, this is a remarkable performance. He doesn’t need to describe his hidden facial expressions for us to know what’s going on, the physicality of his performance is more than enough.
There are some fun parts to this film, mostly as a result of the naivety of the Jon character, through whose eyes the story is told. But actually, it’s populated with some very mixed-up people who have real problems and struggles, and are dealing with them the only way they can. So it turns out to be a quite touching portrayal of mental illness, with a heartbreaking final scene which proves just how good Fassbender is.