Morrowind is like somewhere between 20-30th biggest game world.
Oblivion is today somwhere around like the 17-20th biggest game world.
The game link I showed: http://www.actionradius.com/jdl/default.asp?id=1801&qty=1
This link is also outdated and not complete. It doesn't list Red Dead Redemption for instance.
Elder Scrolls II: Daggerfall - Randomly generated landscapes
Lord of the Rings Online - MMORPG, you'll spend most of your time riding a horse with auto-run (NumLock) on, trust me
Guild Wars Nightfall - 15,000 square miles - MMORPG but without the MMO part in anything but cities. Can't even jump! :yucky:
Fuel - 5,560 square miles - Racing game, you go fast and there's not as much to see
Test Drive Unlimited - 618 square miles - See above
Asheron's Call - 500 square miles - MMORPG
Just Cause 2 - 400 square miles - Never played it, so thumbs up
True Crime Streets of L.A - 240 square miles - In the same style as GTA, so it's got stuff to see and a big world. Thumbs up
Star Wars Galaxies - 200 square miles - MMORPG
Burnout Paradise - 200 square miles - Racing game
Operation Flashpoint Dragon Rising - 135 square miles - According to Wikipedia, "In real time, crossing the island would take 9 hours on foot, 4 hours in a jeep and 20 minutes in a helicopter.
However, it is only possible to do this within the PC mission editor or with the Skira Island Tour mission." So is the game world even open to exploration?
World of Warcraft - 80 square miles (pre Burning Crusade) - MMORPG
Superman Returns -80 Square Miles - This is discredited simply because it's a superhero game based on a movie. And apparently the final boss is a tornado
Far Cry 2 - 31 square miles - Bland, but explorable
Sacred 2: Fallen Angel - 22 square miles - Okay, sounds fine
Elder Scrolls IV Oblivion -16 square miles - With 200+ dungeons, which is overkill
FallOut 3 - 15 square miles - Yep, it's big
Grand Theft Auto San Andreas - 13.9 square miles - This is big too
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Most of the games on that list are MMORPGs which are always huge (they have to be because of the MMO bit) but usually devoid of anything interesting. The other maps are big, but how much exactly can you
do with them? You can't do much with racing games.