Nightwing is at his best leading the Titans or whtever you call the team with Starfire, Cyborg, Beastboy, Raven, Donna and Kid Flash (and give or take that's the combination that has them at their best without looking like sidekicks, rookies or nannies of younger heroes). But even if he is alone, I think there can't be a bigger more popular enemy for Deathstroke than Nightwing and vice versa.