One thing I like about mkx is that a lot of the cheapness ("scrubbiness" I guess?) is largely character based, and very little core mechanics appear to enhance certain characters over most. For example, Injustice's design of having slow walks with un-cancellable dashes lead to certain characters like aquaman, Martian, and zod to absolutely dominate characters just based on that fact. Mk9 pokes by design made certain character pressure impossible to not take a huge risk with horrendous reward.
Not to say mkx is free of this completely: I definitely think meter'd moves building meter on block is lame design left over from igau, and certain characters abuse this way better. Every character having an armored move is both a blessing and a curse. Block breaker could probably stand to be better. But, overall, I would say more often than not, a character is top tier because of their tools, not just how the system works.
Other games have this flaw too; sfiv focus attack is tremendous for many characters, but it's not created equal. Characters like Seth, Evil Ryu, and Rolento can use it both offensively and defensively, while many can barely use it defensively. In KI, a lot of characters can take advantage of using a fast invincible uppercut while spinning the wheel and having the chance to get out of a combo. And the list goes on.
Mkx is not perfect (nothing is), but I do like that the core isn't holding back the cast, just their own tools, which is far easier to tweak and mold. Even some of the lame system stuff they took out (option selects, mashing poke out of blockstun, etc.)