the outdoor areas seem well made, though a lot of fans are concerned if Fallout 4 will have lots of city buildings to explore, with great interiors, and metropolis sized city ruins to explore (that aren't just rubble).
Perhaps one of the surprises is that Fallout 4 will feature every city building is explorable? that would be very immersive, especially multi floor buildings. Also the communities have brought up thoughts on waht the town designs will be like. and if they will really feel like towns.
Well that's just one example of some thoughts out there, but overall yea, level design is very challenging to get right and provide a variety of great different locations for all tastes. It remains to be seen how likable Fallout 4's open world is, and how it all comes together. though Fallout 4 has advantage over Skyrim that there could be more space used for more meaningful things besides terrain. though level design really is important to really make the content, travels and exploration matter more.
Perhaps Fallout 4 might even innovate somethings about level design. Like perhaps, a building for example, there's the normal entrance to get in, or there could be a window the player could slip in to enter the basemant. things like that.
well what do you expect out of the level designs and types of locations? I like more of the city metropolis type stuff, with streets and accessible buildings, and maybe um does Boston have a subway? well they ahven't shown much of the city, because I think one of the major things about Boston is how it's one of the largest cities in the country or region.