After watching "The Dirties", I'm pretty impressed. You can tell that this is a pretty low budget film, and it proves that no matter what a film's budget it, it can still be very impactful.
The final moments of "The Dirties" are very disturbing. There's not as much gruesome violence as one might expect from a film that is essentially about a school shooting, but it is still terrifying, and works better without any blood and gore.
While the movie is very dark and disturbing, don't expect the film to be completely void of any entertainment value. It almost starts off like a dark comedy, with many amusing bits and characters. This IS a genuinely funny film...but it doesn't stay like that for long. The scenes towards the climax are very intense, and as the film progresses we realize more and more that the main character is a legitimate psychopath.
There's some flaws in the film, mainly having to due with technical issues that I had. For example, there's a lot of the cameraman zooming in and out to annoying effect. But, other than those little flaws, the movie is spectacular and highly recommended!