In this compilation of scenes linking game play, Nightwing is uncharacteristically quiet. I suspect that voice actor Jesse McCartney was unavailable to record lines for the game.
Instead, the character at the center of the story appears to be Artemis, and the main antagonist is her sister. Thus, even though seven of the twelve playable heroes are male, the central characters are female. That would be refreshing except for what it hints about which voice actors were underemployed.
I should acknowledge that these remarks aren’t based on, like, playing the game. Anyone who has actual experience in that arena is welcome to add better comments.