TimeLord said:
In response to the rest of your post. I also am a non-pre-Fallout 3 player and I think Fallout 3 trumps New Vegas. I agree that New Vegas is much more positive than 3, but the people in 3 were stifled by a lack of leadership and oppressed by Super Mutants all over DC and the wasteland.
However, I am a great fan on the Brotherhood of Steel and enjoyed their increased involvement all over the wastes compared to New Vegas' 'we're gonna hide in our bunker and even though we keep saying that some of us were locked out, they are never seen in the Mojave'... syndrome.
I enjoyed the wasteland itself in 3 over New Vegas, even with the wild wasteland perk, but maybe that was more the reason I prefer 3's wasteland. It just felt more interesting and involving than New Vegas'. Not to say that New Vegas had a poor wasteland to explore, but I think 3's was more immersive, to the point where I liked to trudge across the Wasteland but preferred fast travelling the Mojave.
Edit: New Vegas' story trumps 3's story, 3 trumps NV's side quests, I wouldn't like to choose between the DLCs for each game
I'll grant you that the Capital Wasteland is a far harder place to live than the Mojave. I sill feel that they are behind the curve of recovering after the war though. With all the weapons and manpower available, you'd think they'd be killing a fair few Super Mutants (especially the Enclave, and when they arrive the BoS). I'm not entirely sure about this so call me on it if I'm wrong, but isn't the population of Super Mutants in DC finite? Eventually over the course of 200 years you'd expect the Super Mutant population to dwindle. After that the threat level is much lower than the Mojave (because let's face it, Cazadors have their own danger level, I'd rather meet a Deathclaw or 10...).
The BoS in NV were a bit of a disappointment, but they did show that the organisation is human and prone to failures. In 3 they were a bit White-Knighty for my tastes although that can probably be attributed to the karma system.
DC certainly is a haunting place, it is so atmospheric that I can't think of any other game worlds that match it. This is actually one of the issues that caused me to be uncertain about NV for the first 10-20 hours, but when I got to Vegas everything just kind of clicked into place that I needed to look at it differently to fully enjoy it. This was also a problem for me in FO3, at first I hated it but then I decided to just wander the wastes and I fell in love with DC. I suppose you could say that I fell in love with FO3 for the setting (and Moira and Three Dog!) and NV for everything else.
Can't comment on the DLC unfortunately as I've only played the first 3 NV ones.