I've never seen Judge Dredd as being a natural fit for MF, although you could certainly use it as inspiration for a MF game. Mind you, I'm biased, having played four different versions of rules optimised for the Judge Dredd setting.
Why wouldn't it work for me? Too much knowledge of Judge Dredd, to be honest. For a start, the Mega Cities are just too organised and locked down. Or were, prior to certain events. For a second, while the Judges would make decent PSH characters in terms of a MF-based game, I'm not too sure about the run of the mil criminals and citizens that they deal with. However, if you bring in such plots as the First Robot War, the Apocalypse War, Captain Skank ... Really, the more fantastic ones fit very nicely with a MF game. However, they're not what I would have turning up every time in a Judge Dredd game. I prefer the satire-based humour of the comic and having that. However, YMMV.
The Cursed Earth, on the other hand, is a very good setting for a MF game and contains lots of classic tropes. Aliens, slavers, Gila-Munja assassins ... oooh. Shiny.
I suggest (if you haven't already) you get hold of the Cursed Earth saga collected editions just to see what madness was wrought in the name of thrill-power. I also seriously suggest that you take a look at the Judge Minty movie (
http://www.youtube.com/watch?v=aavS_XUITXU) on Youtube. Perfect source material.
That said, I have used Judge Dredd to inspire some of the oddities I have posted to the forum, so it is good for inspiration.
Now, Rogue Trooper ... I have to ask, which incarnation? In my opinion, the original run (ie, the search for the Traitor General) is very relevant to MF. You have war on a terminally polluted planet, filled with mutated life forms. You have bizarre weaponry being employed by both sides (Dreamweaver tanks, Hard Rain). You have bizarre societies (Fort Neuro being the perfect example). As if that wasn't enough, you have the GIs themselves, who have been gentically engineered to survive without protective suits in this environment. Very relevant.