In a technical sense NV built on FO3 and in a story sense it took some minor leads from Van Buren. As far as the technical elements go, whatever, but to storywise Obsidian made major progress and certainly didn't pull it all from another game. Unlike Fallout 3, which literally merged the stories of the first two Fallout games together, added some plot holes and a giant robot.
I recall dev interviews saying that the factions had been laid out for Van Buren. I thought the writing was very good, I don't know that I'd call it "major progress."
Really FNV did not seem compelling at all to me until the DLC, which was so good that it made me re-think the original story again. Skyrim is going a bit the other way. The setup and world is so fantastic, but it falls flat in the finish and in a sense of consequence and accomplishment. I won't make a final call until all the Skyrim content is in.
As for the Legion, they got the short end of the stick when material was cut, and that included civilian areas, of which three were apparently planned. However, my only thoughts when you call them 'stupidly evil' and 'not a serious faction' is that you really didn't look at them much other than down an iron sight. Talk to Caesar. He has a grand view for the future of the wasteland. It is true that the legion don't really get a fair go when it comes to their 'image', but there is still plenty of information in the game that shows that they are more than just a bunch of evil dudes.
I didn't know that, about the civilian areas. A shame. Caesar is an interesting guy, but there is still no reason to side with them if you're anything but a sadist. If you're just out for power, there's Yes Man, and if you're out to civilize, there's the NCR which is Caesar's vision without the Roman LARPing.
That said, I don't consider them good myself, and when the Fallout Dinosaur's see you're comment about them being 'stupidly evil', they'll probably try and burn you alive. They're a bit like that.
Fortunately, I don't give a crap.
