Untraceable is just Funny Games for people who aren't pretending to be intelligent. The BIG STATEMENT that it's trying to make is, in effect, the same - people (Americans, exclusively) are sick fucks and we enjoy violence and murder. Okay, I'm down with that, but the big fatal flaw here is that the message is deeply hypocritical. It undermines itself by showing horrible, graphic murders and then castigates us for enjoying depictions of brutality. Thanks, movie!
Not that I mind a message movie every once in a while, but this one delivers with the subtlety of a jackhammer. I can't really get into it without discussing some details of the plot, so here's a SPOILER warning.
Basically, the killer's father committed suicide, and it was highly publicized and a bunch of people watched in on the Internet. This pissed him off and he decided, as some divine act of retribution, to do something very similar to people involved with the incident (the cameraman, etc.) So basically, the movie is asking us to side with the killer's skewed-ass moral pole, shaking its finger at us through the guise of this delusional sociopath. Fucking horrible.
Even without this massive fundamental issue, the movie is just not very good in other terms. Diane Lane is probably playing the most boring character ever: hyper-generic female cop. She's strong, but she cries in the shower sometimes! You know, because she's a woman. Also, she has to skip her daughter's birthday party. Anyway, the only movie characters more boring than her are her cast mates. All of the men around her are whitewashed and ineffectual, leaving everything up to her. This shit is basically made for Lifetime, were it not for the fairly graphic killings and occasional "shits."
Uh...this really sucks. Less insulting than Funny Games, but more ineptly made. An all around waste of time.