Gothic 2 disagrees with you. Heck, Gothic 1's world is significantly smaller, and it's much better handcrafted than whatever Bethshitda made with Skyrim.
Also, I want to object the notion that Skyrim is an 'open world' game. Yeah, the main gameworld is continuous, but you need to go through a loading screen to enter cities, caves (even smaller ones) and I vaguely remembered some small shack in the middle of fucking nowhere. Meanwhile, with the exception of Old Mine/New Mine/final dungeon, the whole gameworld of Gothic 1 is truly continuous with no loading screen separating the camps with the wilderness. Not to mention the fast-traveling method of the Gothic games that you can acquire via teleportation scroll or a fixed teleporter does NOT have any loading screen whatsoever.