In a nutshell, this is by far the most unique film I've ever seen. It steers away from all the hollywood cliches and really is a different experience. It's now one of my favourite movies and part of the reason why I enjoyed it so much is because I had no idea what it would be about, which really contributed to the "surprise" factor.
I'm just going to go over the "warnings" while trying not to spoil anything as much as possible (I know that a review for these info are already provided on the front page, but I find many of them too strict & I'm basing this on a 14+ age group):
POSITIVE MESSAGES: without giving too much away, the easiest message many people can get away from this film is to stay away from crime
POSITIVE ROLE MODEL: like the rest of the movie, this film doesn't really have any "stock" characters and nobody is completely good or bad. This movie really shows the two sides of people and some characters do possess "positive" traits.
VIOLENCE: Brief but very graphic and shocking violence. There are some really gruesome scenes that you don't see in many movies. However, this movie doesn't glorify violence or use it in a comedic way.
SEX: a brief (and non sexual) nudity scene of a couple of topless women in thongs showing bare breasts and buttocks
LANGUAGE: Constant swearing with f-ck being the worst (and most frequently used). Some racial slurs/sexual innuendos
CONSUMERISM: didn't really notice any. Occassional well known companies are shown (in a very unobvious manner).
DRINKING/DRUGS/SMOKING: occassional drinking & smoking
While I think teens around 14 can watch this film, I recommend older teens to watch this as they're more likely to appreciate (and understand) the story and uniqueness of the film more. Though none of the characters are really "good", you may actually find yourself caring about them or at least understanding their views. The movie is slow paced at first but has a huge turn somewhere in the middle. For those who want a break from your typical hollywood movie, this one is for you.