I think that the dark trashy background was to show the sad and depressing state of the world you were in. If you look at the NV stuff, you see it more colorful, and less damaged, not hit as hard as D.C. was, and therefor less depressing than FO3 wasAWAR said:Fallout 3 greenish-trashy backround was boring and uninteresting.
I want to see just a larger world. More of everything, more missions, more locations, more people, ect. Also, more enemies hiding out along the wasteland. The reason is that it kept the journeys fun and the enemies kept you on your toes. Oh, the biggest new addition, more radio stations w/ more songs. I'm almost able to sing all of Three Dog's songs, which were great, but it was that, patriotic enclave propaganda, or if you did the mission Agatha's violin, which was nice, but still, more of it would be better.
Just more of the experience is what I want, the more the merrier ^^