I was watching some battleborn videos and I was thinking about the fact that battleborn only has one single player mode, and then I realized it. why battleborn has no other modes, it is because it doesn’t need them. Or rather because they are already in them. I haven’t seen all the missions but when watching the Calderius rescue mission It donned on me that it was a lot like a single player mode in which you guard a base against a hoard of enemies, and it is other single player modes are just given a story and put in the campaign.
that’s why the devs say that they are meant to be played over and over again. that is why some missions may be more episodic, and that is why you get ranked on how well you do.