Absolutely phenomenal.
It's dark, gritty, insightful, and incredibly deep.
If you consider yourself a movie buff, and love the art of cinema, it's a must-watch.
It can be a little slow at times, and the dialogue can be hard to hear, but the use of music and sound paired with the acting and cinematography tell the story well enough, that the dialogue is fairly ancillary.
Hands down, Nic Cage's best film.