The game is worse than MK8 by far.
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Free roam mode is boring as hell
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There is no Mirror mode
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There is no 200cc mode
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There are no remastered classic tracks
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You can't customize the karts
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There is no black yoshi
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There is no Gold Mario or Gold Kart
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There is no Diddy Kong
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The first "lap" of most races isn't even the actual track. Its just driving to the track from the previous one.
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Unlocking some characters depends on a randomly-given power up that randomly turns you into the character
The only good thing is some of the new tracks are kind of cool, and the knockout mode seems kinda cool too (though I haven't tried that mode yet).
Maybe some of this will be fixed with DLC, but to charge $80 initially for this game the DLC better be free.