And it's definitely worth a couple of re-watches. There's so much symbolism in that movie that you don't even notice the first or second time.
Loki (Gyllenhaal) is one of the most fascinating characters I've ever seen in a movie. Mysterious yet morally impeccable. I read a theory that he's meant to represent some kind of god, which is interesting in hindsight:
tldr: Fucking awesome movie.