I've watched several episodes of Defiance, hoping the show would “grow on me,” but I had to give up the effort.
I just couldn't bring myself to like the characters or be drawn into their relationships. One alien species (how about the Castithans?), instead of a whole Babylon 5-like assemblage, would have been sufficient to provide plot conflict. The Irathients, particularly their outlandishly costumed “Spirit Riders,” are an insult to Native Americans.
Pairing the television series with a video game may, as the producers claim, add richness to the overall Defiance experience. I am not a game-player, so I wouldn't know.
Defiance may share a little DNA with Battlestar Galactica in composer Bear McCreary and some of its production staff, but Defiance is, by no stretch of the imagination, in the same league as Battlestar Galactica.