The highlight for me is Karl Urban's performance. He has totally committed himself to the part. In the main he is excellent, but on occasions it gave me fanboy shivers remembering iconic Dredd moments and imagery as he brought them to life.
The main thing I liked about the action was that it was very matter-of-fact. Dredd kills criminals in a functional and efficient way, without any unnecessary emotion, or need for a complicated, harrowing back story. You get the impression that Dredd does this everyday, and twice on Fridays. For instance, Dredd doesn't think twice about taking the opportunity to shoot two criminals in the back without warning. It's also very believable, there are no ridiculous feats of strength, or unrealistic accuracy, you get the impression 'anyone', with the correct training could do it. Dredd is just a normal man, he's just a hell of a lot more determined and resilient than the rest of us.
The negatives aspects of Dredd aren't really dwelled upon in this story, but I think they are there. It's more about showing Dredd in a reasonably simple story and getting his and probably more importantly Anderson's characters across.
It's a bit more full on graphic violence than I'm used to in a film, but because it was Dredd it fitted. I'm obviously a pretty big Dredd fan and I loved it.