Yeah but when Daredevil is fighting some bad guys, it's intense because he's only human and there's always the chance he could die. Obviously he wouldn't, but he could always get shot, stabbed, beat up, injured to near death etc etc.
With someone like Superman or Hulk, there ain't much you can do outside of Kryptonite, even then it only weakens him not kills him. In fact how can you even kill Superman? Is he truly invincible? Because if a nuke and a Kyrptionian Blade (his supposed weakness) can't kill him, what can?