I think my biggest TYM pet-peeve is people trying to come up with big picture narrative off of one tournament, especially since each tournament gives you a different narrative.
Regardless of whether Injustice is actually balanced or not, how does this particular top 8 prove anything, one way or the other? You have 8 different characters in top 8, two of which being Catwoman and Doomsday. You say "maybe Catwoman isn't as bad as 16 bit says" (let's ignore the fact that his word probably holds more weight than yours since he mains her). Okay, let's say she is. How good is she exactly? Top 10? You can't actually believe that. And yet, she still made top 8.