My impression is that its not a matter of good vs evil its a matter of two dynamically opposed philosophies on how best to evolve the state of the universe. The Traveller is only "good" because it morally aligns with our ethics. The Darkness is only "Evil" because it violates our sense of morality. The reverse is true for the Hive. Both Guardians and the Hive are immortal undead servants of their respective philosophies being directed by a will greater than their own. Both sides hold their respective champions in a form of reverence or worship ( difference being the Hive are zealots ). The Hive are assholes but they're not a faceless evil. Oryx wouldn't be after us if he didn't have an emotional attachment to Crota. The Darkblade wouldn't be in a pit if he didn't have the hawts for a girl.