According to the Scoring pages, all of the gamemodes are, to some extent, dependent on one's consistency in hitting notes whether it be accuracy or combo. Also noticeable is that some scores with lower max combo & accuracy may beat a score with higher max combo because of a higher "Average Combo" or "Consistency Rating", as in the misses (or non-perfects in general) are more concentrated thus giving higher score. It may be good to show it (or a similar kind of scoring) to the player to help explain such results.