Why this failed
I saw this in the theaters and I loved it, but I will tell you why I think it failed. The marketing. It was advertised as "Dredd 3D" which comes across as very gimmicky, especially with the excessive use of slow-mo in the trailer. Not to mention the line "I am the law". This movie should have tried to distance itself from the Sylvester Stallone abomination, not repeat it's most famous line.
I told everyone I knew to go see this and they all said "the Stallone movie? I am the law? Looks stupid". It was only after it came out on DVD that they gave it a chance and realized how badass it is. Unfortunately this did so poorly opening weekend that it wasn't even given a chance at word of mouth to help it before it was out of theaters. Probably from my above mentioned points.
Idk, I'm watching it now for literally the 6th time and it's frustrating that a quality action flick like this will not get a sequel.