Indeed, this game is awesome and it's a huge improvement over IJ1: Excellent roster, a huge improvement in graphics, an already seen deep-gameplay, awesome story mode, huge replay value, gigantic amount of content and modes, and awesome online mode. This game has so much to offer from all angles. I still prefer Mortal Kombat over Injustice, as MK is even better, and yes MKX is a better game overall, but IJ2 is still an excellent game that has even set the bar for the fighting game genre in a couple of regards, just like MKX have set the bar in a couple of regards too.
This game is awesome, period.