In the general scheme of things, MK9 had more BS simply going by how many characters are actually viable competitively and can stand against the top tiers.
In injustice most of the cast can actually compete with MMH/Batgirl/Aquaman/Zod, even if it's an uphill.
in MK9 however; Kabal, Cyrax, Freddy and co. basically tell everyone else in the cast to go fuck themselves >__>
My point? MK9 is total BS, this is not even an argument lol. However this applies to most MK games anyway, the series is not exactly known for being "balanced" so it's whatever to MK fans at this point..
Keep in mind injustice was the first game and everybody was a new character, where MK has been in the game for too long to have this much nonsense lol.
At least NRS did the right choice in MKX and just cut the characters they couldn't balance out