well for the starters the issue of racism should be very apparent in most people's lives. I don't think this film was an 'eye opener' to show that racism still exists. Secondly the director has completely spoon fed the audience in showing this. There's no subtlety in showing that racism is a big part of the film. All the characters have direct conversations about being racist and it's so damn shallow.
If you watch a film like No Country for Old Men you will see what subtlety is. The film has a face value of a B movie chase/robbery film, but also has many different levels that include other themes. For instance Sheriff Ed Tom Bell's Cowardice, the changing times of America, the comparisons of good and evil. Much like Kubrick's movies it has all of these themes tightly woven behind a plot driven story.
Crash is just a load of one dimensional characters out right talking about racism, whilst committing racism. There's nothing else to it than that. You can't really read much more into it because it's such a shallow film with only one purpose; to show the world that racism is still out there and it's not there. The problem is most informed people already know this and don't need a second rate film to shove it in our face.
I think it's pretty obvious that Crash isn't trying to subtle or naturalistic. To quote Ebert: "Haggis is telling parables, in which the characters learn the lessons they have earned by their behavior." The bluntness of the characters serves a purpose, and I think it helps to presents the films commentary. I already attempted to explain why it was more than a "racism is still out there" message in some of my previous posts, you could read them if you wanted to.
Just to discuss a bit: The film is an examination of (1), the consequences of racism (or maybe I should say the consequences of making a judgement about anyone or thing, whether that judgement is good or bad), (2) the blurred line between right and wrong, moral and immoral, (3) how the world and environment around them has shaped the judgements of the characters portrayed in the film.
Some examples: The fact that every character is portrayed as either good or bad at first, but then quickly changed. One of the initial scenes has Ludacris and the other guy discussing about racism as they exit a coffee shop or something. I watch and make a judgement about them: they're two seemingly normal guys, even intelligent, thoughtful, until they rob a car from two people at gunpoint. Every character is portrayed at some point as both moral and immoral. The film even asks itself why these characters are racist. I remember Matt Dillon, a morally empty character at first (he sexually abuses a woman he pulled over), until we see how he cares for his sick father, who can't get insurance. When his father's HMO officer denies him medical care, Dillon throws a few racial slurs at her. Racism is a product of anger, but what connection does racism have to anger? Even later we see Dillon save the life of the same woman he groped, does this still make him a despicable character, despite him saving a life?
I think looking at the films message as "racism exists" is more so the opinion of the
uninformed viewer than the informed one. Trust someone who reads into and analyzes a good majority of the films he watches: while the films characters can certainly be shallow at times, the film isn't. I don't think a film that asks so much of its viewer can be.