The problem? MK is all about Fatailties. It doenst have much more depth then that. No Crossovers, openings for Supers, or in other words it cannot be played at a tournament level. Its a just-for-fun game, and just-for-fun games usually are not considered even to be a valued fighting game. You need to have competition, and fighting games die a painful death if theres not enough depth in the fighting mechanics to keep it strong like MvC2, CvS2, GGXX, and SF3. Thats why you see those in fighting game tournaments and not MK.
EDIT: BTW MK is horribly clunky even for normal moves.
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