As far as the game goes, I think it's easily the least flawed NRS game to date (and probably the best balanced), and definitely the most polished. The flaws for the most part, are mainly down to personal preferences and that's a good thing. However, in case said flaws bother you, they can be considered MAJOR flaws. Stuff like 50/50's and super oppressive offense can be pretty tiresome if that's not your cup of tea.
Personally, I'm not a big fan of the 50/50's, especially combined with the ridiculous run speed that many characters have (that also ties in to how dangerous knockdown situations can be), but I really feel that's my only gripe with the game. And I realize Injustice was a 50/50 heavy game as well, but in MKX, it just feels like setting up 50/50's is a more straightforward affair, which makes it a bit more annoying.
On the whole though, I love the variation system, I love godlike net code, and I really don't think the game has any major issues (some so called issues are really overblown or flat out untrue, such as so alleged lack of AA options). So yeah, I like it quite a bit.