Actual side quests, that are interesting. Not "Bring me 55 rushrooms".
Actually rewarded for attacking enemy camps and fighting in the overworld so I don't decide to avoid pretty much every fight because it's not worth the effort.
More abilities so shrines/dungeons are more varied, and it's not as easy as "Obstacle? Scan with magnet."
BOTW had many shortcomings that a sequel can improve.