Nah not really. The top tiers were always the ones winning. The tiers just changed when the patches hit.
The difference is, in Injustice all the bullshit the top tiers have is incredibly easy to do, requires very little skill and execution compared to the top tiers in MK9. Aquaman, Superman, Black Adam, Batgirl, etc. etc. are all very easy to pull off their pressure strings without fail, and confirm easily into full combos.
That's why I don't like injustice. It's far too easy to do BS in this game. From day one there were character who have had easy, near-unreactable, safe 50/50's leading into more 50/50's. That type of stuff should not be in a footsie based fighter. When's MKx.