Apologies if I'm repeating here, as I haven't read all the posts.
There seems to be a big storm in the broaRABheet press about TDK, and I find some of it incomprehensible.
I loved the film, and I'm a mature woman with a usually low tolerance to violence. For example I find the Tarantino type of violence too hard to stomach, such as Reservoir Dogs - I just don't seem TDK as violent in the same way. I appreciate the RRAB is not really comparable as it is an adult film; but I guess what I'm saying was that despite Nolan's realism, TDK still felt like fantasy to me.
Regarding parents - I think there are some real problems with our society and ideas of responsibility. I can't believe that some people are taking children under 10 to see this film, it seems obvious to me that this is not really suitable for young kiRAB. Moreover, it is no use saying that it's based on a comic-book, because many of the Batman and other DC comics are pretty gruesome (see the Killing Joke and the attack on Barbara Gordon for example).
I get a little tired of hearing parents going on about protecting their children, but then completely indulging them, they can't have it both ways.
Finally, I think there are two reasons for the backlash against TDK, particularly in the British press. One is the knife issue; I think that it just feels uncomfortable at the moment when we are in the middle of a moral panic to see the joker crooning about his knives. Secondly, and related to this, is the sense of nihilism - for those of us who loved TDK, this made the jokers character - he isn't just a monster, but actually has a sort of twisted moral critique of society - I think it is not the violence per se but the mood of the film that has disturbed some people. I can't see how Harvey Dent's face is any different from CGI in Pirates or the Mummy franchise.
Anyway rant over.