Far Harbor Island was about the same size as the Nuka-World park, but the more interesting and varied terrain and all-enshrouding fog resulted in a much more interesting and atmospheric setting.
The expansion is definitely a bit less engrossing than Far Harbor, though. Setting the game in a theme park is a stroke of genius, as each, differently-themed zone of the park gives rise to different stories, puzzles and enemies, and allows the game to riff on Disneyland, Westworld, Jurassic Park and various other influences to entertaining effect. You can explore this area at your own pace, picking up side-quests, meeting characters, navigating between different factions and following the main storyline. Nuka-World, like Far Harbor, adds a large new area to the game which functions as something of a microcosm of the traditional Fallout 4 experience.
