Are you talking about the game or the game world ? If it's the game then the game has lots of special stuff and the raid mode is just something else, easily the most satisfying and fun thing from a game released last year.
The maps are not ginormous but they are white big in that they lead to many indoor, sub sections seamlessly with no loading once the game has loaded (most of the time, sometimes it will have small mini loading ala Mass Effect 1 when playing strikes).
Seems to me MS throes in cloud everywhere and every time they have to promote something. They are surely doing it less than they did it earlier but still.
I played the game since beta, so i have a pretty good idea what the game is about, and there is absolutely nothing in that game that makes any special use of any kind of cloud that i have not seen before. As i said in my post, "On the contrary, the maps are small compared to most other mmo games and the streaming is obviously limited by the 512mb consoles and storage tech." The way that for example the Earth is split up and you have to travel through certain parts of the map to get somewhere must be because of the limits set by the old consoles. And by todays standards the invisible walls, death by misfortunes etc is pretty disappointing.