I don't know if you can say that the multiplayer, and I am assuming you mean PvP by that, was their primary focus for the game. I think it is meant to be an equal part to the story. That being said the story really suffered because they had to redesign it when the game only had a few months left before release. They had to repurpose existing elements of the game which is why the story seems so fragmented, because there are large portions missing.