A SLIGHT SPOILER WARNING TO THE DREDD (2012) MOVIE BELOW:
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Breja: Dredd is just totally unphased by the situation. This is what he does, he knows he can plow through whatever is thrown at him, and he does. No tension.
He did run out of ammo, and was shot through with an armor-piercing bullet. Saved by his partner.
A bit like Robocop. Robocop also plows through whatever is thrown at him, but still becomes vulnerable at a certain point of the movie, and against his nature must rely on her (female) partner in order to survive. At the same time, he learns a thing or two about humanity from his partner.
Part of the charm (in both cases) was that they were seasoned professionals who are able to push their fears to the background, but still end up vulnerable. For some reason I am now also reminded of a third movie,
Leon. Again, a badass professional showing no fear and shooting down everyone, but then he meets someone special...
Also, part of the "tension" in Dredd came from the protagonist having a very simple, cynical and black and white view on the world, which causes a bit of friction with his partner who represents the more humane view on life in the movie.
I must again stress though that I don't consider Dredd as good and interesting movie as Robocop, but I keep finding these parallels between the two (and maybe even Leon).
Die Hard (the first movie, I didn't really like any of the sequels that much) was a great movie too, in a somewhat different way. Its "the underdog saves the day"-theme felt very refreshing back when you were used to Dirty Harry or Rambo type of heroes who have no weaknesses.