No problem. I also explained in another post my stand about how it looks compared to the games you mentioned (well, GTA at least).
About the "emptiness" of what Nintendo showed, most of the footage we've seen is taken from the great plateau, which is basically a tutorial area, and there are story related reasons why there's only one npc there. Still is a pretty big area with tons of animals minding their own businesses, enemies that interact with them (they even hunt and kill them if they're injured, to regain hp), at least one field boss, asleep guardians and other stuff. It's really not empty, and there are many different areas within it (a more dense forest, a snowy area, fields, etc).