I saw DREDD and I liked it, but I saw it in 3D so I'm holding off on a definitive opinion on exactly how much I liked it until I see it in 2D. 3D kind of throws me off and I end up not being able to properly judge a film. My initial thoughts were that it had a lot of kick ass action, but the Judge himself kind of came off as a sidekick and it felt more like Anderson's movie. I was also a bit disappointed that 99% of the film took place in a single building, I'd have definitely preferred if they utilized the entire city.
Which brings me around nicely to a Dredd game. I think a Dredd video game, if it were a nice open world type deal, would be amazing. Cruising around on your big motorcycle responding to random calls and doing various side and story missions would be fun enough by itself, but I think some sort of new feature where you actually make judgements on the criminals would be great. For example the player could see to it that they go to jail for X amount of time, pay a fine, or get executed on the spot. Naturally there would be a lot of over-the-top gun battles and it might even be neat to see other Judge's cruising around town doing their thing.
And just to keep the post on topic, I sort of worked out a way for 47 to take down multiple armed enemies using only melee. This works best with only two enemies, but depending on how quick you are you might be able to do three and keep things quiet. You fake surrender, then grab a human shield and move close to another bad guy. Once you're near enough knock out your hostage then immediately attack the next guy, he shouldn't have time to get a shot of. The third guy, if there is one, will probably open fire while you're attacking the second guy though.