So...yeah....No technology that is indistinguishable from magic type of stuff. Please keep it plausible near future type of tech.
I would take well-implemented co-op over MP any day.
Not sure if this has already been posted, but I really want no sudden invisible wall where the world map ends. I don't want a text saying "You shouldn't go further because this is unknown territory" like in Fallcrap.
I demand creative solutions, like canyons or buildings or something like that.