Injustice: Gods Among Us
I already 100% completed the main story, leaving only the S.T.A.R. Labs missions to handle, plus random battles.
I think right now I favor both Green Lantern and Aquaman (no lame jokes, he's pretty epic in this game) with Nightwing as my third. I haven't had the time to sit down in any capacity to play through every character so far, but I do recall how powerful Nightwing was when I faced him in the story.
So, any XBL players with the game? I'm pretty bored and would love to have sporting challenge (not necessarily today, I'm working D:)