Maybe a bit slow and long for some. I didn't mind the pace. I liked the mystery. I liked the characters. I liked the music. It did have a creepy atmosphere but it could have been amplified at times. The spoilers are where the movie gets good.
MAJOR SPOILERS
Was the girl Lucifer is disguise? She seemed to be judging Corso and even looked pleased when he eventually killed someone. Corso was immoral but I don't think he was evil. In the end when corso and the girl were having sex, I think Corso knew who she was. Lets not forget that the girls floats in mid air, so it was pretty obvious she was at least and angel or something. But In the end Corso gave himself up. He was willing after temptation. He fell in love maybe. And the devil was on his his shoulder the whole time during the movie.
He was already moderately sinful at the beginning, and that was a great start to the character. I liked how Lucifer wasn't interested in stereotypical worshippers or people obsession with her, but wanted to manipulate. The girl or Lucifer is even seen reading How to win friends and influence people in the lobby. After all Corso is the one who approached the girl, who also has the appearance of two faces in a reflection. The devil has two faces remember.
This is a movie to re-watch for sure. I can see why it went over people's heads as it's so subtle and makes the viewer work hard for clues, not that it's an insanely complex plot. But one thing still evades me, and that's why Lucifer wears odd socks? Pure evil