On one hand i liked the movie. It created great atmosphere, the story and world are simple yet interesting. I love the play by Lena Headey
(Ma-Ma), i think that she is the strong point of the movie. Conceptually, I really enjoyed the implementation of telepathy and the use of it by Cassandra Anderson (played by Olivia Thirlby). The scene where is goes to into Kay's head (Wood Harris) and messes with him just made me love her :).
On other hand, what i really did not like, were the costumes (e.i. Judge Dredd was comical with his helmet, or the Judge's motorcycles). I think that for a movie in made in 2012 they looked like from cheap sfi-fi movies in 80's or 90's. Finally, what made the movie, for me, to go down several points, was the scene with two (or three?) Gatling gun's and Judge Dredd running from their fire like for 5 minutes, and they firing thousands and thousands of rounds, destroying half of Megablock floor, killing a lot of civilians around Dredd, but never hitting him. That was just ludicrousness and i hate scenes like that.
This might be just for me, otherwise i would bump the rating to 7 and if you are a fan of Dredd comis (I have never read it) add another point to it.