I came, I saw, I'm not terribly excited.
The multi-player aspect doesn't scare me much. Borderlands and Borderlands 2 were both made for co-op play but singleplayerable and I had fun playing solo on those. It's just that there's no real hook here at all. I think he needs to give us some serious background on the kind of story that's going on here and the kinds of choices we're going to be making.
P.S. Singerplayerable: a game designed for multiple players but can still be played by a single player. You heard it here first!