There was a difference between the pre-queen Borg and the Voyager Borg. During a real war, didn't the Borg shed the queen and revert to it's previous non-emotional collective? The queen-led Borg focused on something as petty as bringing 7 of 9 back to the collective, taking personally the defeat of a pest like Janeway and Voyager, which the pre-queen Borg, or the Borg at war, would never have indulged.