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What gets me about the Creation engine based games that Bethsoft makes is that maps can be ANY size, practically. Before it was shut down there was a fan project to make the entirety of Middle Earth that Tolkien had mapped out using the Creation engine (the engine that Skyrim and Fallout4 use). That's an area of thousands if not tens of thousands of square miles!

Now, granted, there's something to be said for brevity but it really takes me out of my sense of immersion when someone says "Go all the way to Whiterun" and it's a five minute in-game walk, and this major hub of traffic and trade has seventeen NPCs in it.

Also, if you're looking for more to do in FO3 and FONV there's a mod called Fallout 3 Interiors and Fallout New Vegas Interiors that takes the inaccessible buildings (well, many of them) and makes them able to be explored, with loot and various unique items in them. For example, there's a now-accessible ruined department store in downtown DC that has a toy department where you can scavenge action figures of the various combat robots you encounter out in the wastes!

Little touches like that are great.

Here's some trivia about the Creation engine. It actually dates back all the way to 1999 with Morrowind. Bethsoft licensed a new engine called Gamebryo, and used it to create Morrowind and the various expansions for that game. When they created Oblivion, the next Elder Scrolls game, they switched to a newer edition of the Gamebryo engine called The Creation Engine. It was modified by increasing texture details and adding in a more detailed physics engine. All the various add-ons for Oblivion used that. Then Fallout 3 came in 2008, and New Vegas in 2010 and they too used Creation as their codebase. Skyrim and its add-ons came in 2011 onward, and of course now we have Fallout 4 and its add-ons, all still using The Creation Engine which is 12 years old. Ancient in terms of computer software!

Having played Far Cry 3 and 4 which use the Dunia engine I can honestly say that while I prefer the stories and sub-plots and side quests of The Elder Scrolls series and now the various 3d/first-person Fallout games, graphically they pale in comparison to the Dunia Engine games that Ubisoft has.

One final note about world-size: Daggerfall (the game that preceded Morrowind) has a game world of about sixty two thousand square miles! Compare this to the 15 square miles of Skyrim!