First game was good, but a little underwhelming as far as content goes, not to mention, I really, and I mean REALLY disliked almost all of my companions except the preacher. The writing was good and subpar, character development was just...it felt like they shoehorned things in that didn't need to be there, to hit certain bulletpoints, but ultimately added absolutely nothing of worth to the overall story arcs, and the character backstory arcs.
That said, it was pretty, exploration was good, but I think I would have preferred less companions and more exploration, as I feel that aspect was one of the better things they did with it.
What I would want in a sequel is simple. More. More planets/bases, more interesting content, more mainline quests that take you all over, and more interesting towns and places to explore. What I don't want more of is bad companion designs, and even worse writing.
I'm cautiously optimistic, but I'm not preordering it, especially not if they go completely Xbox exclusive. My guess is that they won't, although it may start out as a timed exclusive before it hits PC.