It's a matter of personal preference at the end of the day, really.
I love the 'dark theme' of Injustice, I like the game's depth, the cast...it's a game I really like. So yeah, to me it's really fun to watch.
For instance I think Marvel is plain boring to watch, same teams all over, Virgil in every team and bla bla. I think it gets more people going due to its fast pace and all the shizzle flying around.
However I find it really 'stupid' to compare Injustice to MK, they are different games with different mindsets, why do you even spend time comparing 2 different games? Just because they are from NRS? Please.
People don't go and compare SF4 to SF 3rd Strike, right? Cause even though they are from the same company they are different games!
Treat Injustice as it is. Don't like the game? Don't play it. Boring to watch? Don't watcht it. Bought it anyway? Sell it. It's dat simple.
Just stop the bashing and downplaying if you don't play or like the game.