I got Injustice for free a while ago and I suck at fighting games, but I enjoyed the story and doing a couple of Arcade runs, so I guess it's accessible for a fighting game, but I'm unqualified to say anything about the more technical aspects of the gameplay.
The story is dumb, but it's a capeshit game so that's to be expected. At least the cinematics are never that long and you get to play with plenty of different characters too.
Overall, I don't really know how to rate this game, but I enjoyed my time with it so I'm going with that.