Picture Link being able to do combos with all of his weapons? Mix a deku nut with the megaton hammer for a shockwave effect. Or being able to shoot a thrown bomb with an ice arrow for a freezing effect? The combo moves could be managed much like classes in COD4, pick a set of combos and mix and match them at will.
Take all of that and add it to what's already there and you've got an epic game.