How did nobody mention the king of scale? Elder Scrolls. Oblivion + Skyrim has more scale than everything else in this thread put together XD

Also Demon's Souls, Dark Souls 1, and Dark Souls 2

Yep, WW is on up there

When someone says "Sense of scale" I honestly never immediately think of a large, open world. I think of a game that is adept at either escalating the size of environments (to me, a sense of verticality makes me think of a large sense of scale more than a lot of land), enemies or even increasing the impact of the situations and scenarios the player is presented with.

To me, The Wonderful 101 did the latter exceptionally well. I never experienced that same feeling of "They can't possible go further than they have... BUT THEY DID" than with that game.It really does just keep getting bigger and bigger without slowing down.

For a game that I played, it will go to The Wind Waker, since the world is soo big and empty

Xenoblade X looks huge, but I haven't played that yet, obviously.

Came here to say this, the Elder Scrolls games I have played (Oblivion and Skyrim), were immense. Although you aren't always dwarfed by an object in the game, the world was to scale for the objects it portrayed.

From Software

Armored Core For Answer PS3/360

Armored Core V PS3/360

Armored Core Vertex Day (ACV DLC)

XCX, WW and gta V would be my pick

Games for its time:

Shadow of the Colossus

Dragon Quest 8

Xenoblade Chronicles

Games of today:

Xenoblade Chronicles X

Final Fantasy XV (What we've seen so far of it anyway)

Potential:

Zelda Wii U

MGS5

Dark souls had a great sense of scale, if you could see it eventually you'd wind up there, the second did to a degree but the world felt much more disjointed. The Elder Scrolls games do as well, though they don't have very good draw distance but certain areas and cities are so vast you can get lost in them for hours (and if you're masochistic, days in the case of daggerfall).

Far Cry 4 wowed me when I first played it, you're sort of in a valley within 2 mountain ranges, and those mountains being really detailed helped with the sense of scale.

Also, I'll mention Battlefield 4 because it will probably be overlooked. Both single player levels and the bigger multiplayer maps have awesome scale.