Overall its a fun game to play. I stopped for a while, but coming back was a breeze. Theres lots of incentive to play, including events, and the graphics are great.
However, the game can be addicting and very expensive to get into. For example, at some point your free cards will stop being able to win, so youre left either spending at least $13.99 for one card and then training it up, or just plain grinding for coins/levels.
I havent spent a cent and dont intend to, but I remember why I stopped playing; the grinding is rough.
Caped Quillsader about Injustice: Gods Among Us, v2.13