There seem to be three types of people commenting in this thread:
1. People arguing semantics and slightly thread detailing by trying to discount Jason's opinions.
2. People, despite preview evidence to the contrary and not having played it themselves, saying exactly what is and isn't in the game (for example, being absolutely sure there is a grand connecting story despite little evidence beyond a 10 second blurb on the E3 treehouse).
3. People who are concerned with the game's potential shortfalls and are trying to temper expectations.
I preordered this game and am hoping for the best, but no overarching story, with minimal character interaction, is concerning.
I don't take that treehouse comment as confirmation for an overall story. The guy says each character contributes in their own way; that "way" could certainly be self contained in their own story.
Regardless, amusing thread to read so far. Keep it up, everyone!