I don't think the difference between BG and DAO is the 3d.
In BG, you could walk around in any given region (except for the dungeons, yes). I later games (KoToR, ICWD, NWN), you always have to follow a godamm road between two hills/two forests/two walls.
Even the most open areas of NWN2 (the forest in MotB) or DAO (the forest too) feel that way. You have a road, and you follow it. The limits around the road are just a bit farther than usual.
Now, I know most people here don't like MMO's, and especially hate WoW, but at least in WoW, you could run around and explore for real. Even without going to the most hidden places (the Troll village near Auberdine, Mount Hyjal, etc.), you could still go back to a province and find a place you've never seen before: a cavern of some sort, an abandonned village, a few easter eggs, etc.
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