whilst i like fighting games i am god awful at them
I am too. Injustice is a very well designed game, though.
My issue is the only single player content is the game, Battle mode (essentially Arcade mode with certain challenges) and STAR Labs (essentially challenge mode, certain characters with certain challenges to complete). Overall the story is the only part I'd recommend playing, so if you can, just rent it. It'll last you about 6 hours, but if you're anything like me and my friends, you'll likely be hooked for all 6 hours.
PSN ID: armyflame (formerly Troll_Face_Flame) X360 gamertag: That Guy Flame Call of Duty 2 is still the best of the series.