I will try to catch it some time. I'm someone who doesn't throw the Stallone film under a bus, though. He is dreadful as Dredd and the film suffers. I think it's because he's a very emotional/human sort of actor while prior to that I'd have said RoboCop is the closest to actual Dredd, right down to the confusion of having an emotional response to something.
That said, I appreciated how the script tried to tie together a few classic stories, put an excellent Hammerstein on screen and - even though I'd have preferred no Angel gang at all - did a half-decent job of them too. The Long Walk was great as was Von Sydow in that role.
But really I just think the marriage of extreme violence and very black humour can be tricky to pull off, and is even harder if you're also trying to do every other part of your adaptation justice rather than having a clean slate to work off.