Personally I think the best sounding fighters are the ones that make you wonder what genre your getting into. Soul Calibur, Dead or Alive, Smash Brothers, Tekken.(aka king of the Iron Fist)
if I knew nothing about comic books, the name "injustice Gods among us" would definitely peak my interest. When i think of the word "injustice" i think of an uphill battle where he odds of success are heavily stacked against me. my kind of party.
As a comic book fan, the theme of Injustice is heavily across the DC universe. Im sure the families of the Joker's victims know all about Injustice. There is also the Injustice League,
and about how this doesn't sound like a fighting game, well good. it unique, I would rather have it be called Injustice than, DC fighters, or DC combat or Joker X Justice League and ultimately it doesn't affect the quality of the game. It takes a person 2/3 of a second to find out that Injustice is a fighting game.