at least its him singing
Didn't always get what all the symbology meant, but the movie is always engaging, with some great visuals. The Faustian take in it is pretty cool, even if it's a bit illogical.
If this movie hadn't failed to make me care even remotely about the character(s) then it probably wouldn't have failed to mess with (at least) my head, either. But it did. The story was boring, and although not everything was as predictable as I had expected, the MC's personality and behaviour, in combination with his superficial and annoying everything, made it too easy to not care about anything even though it was just as easy to see something was wrong.
Or, maybe that was just me.