I wouldn't ignore smite damage either. If we are only contributing base damage then spells off, no hunter's mark. It's not guaranteed to be taken by the ranger, or cast over other spells, or maintained because of concentration checks on a melee build. There's more to dispute the relevance of hunter's mark than smiting or action surge. Smiting and action surge are more reliable.Yes we can. We ignore Action Surge for the same reason we ignore the Paladin's Smite. We're comparing the ordinary, base, damage.