Ultratwinkie said:
Except the DC wasteland is contrived, but it stays the same for 200 years while the West Coast developed its own culture, technology, and governments. California was worse off than DC, and yet it still developed the NCR.
The Capital Wasteland doesn't really "stay the same" for two centuries. Just because it didn't produce a nascent government/state like the NCR or the Legion, doesn't mean that it didn't develop its own culture, nor that it simply stayed the same.
The DC Wasteland seems consistently more fragmented than the West Coast - more centred around individual settlements like Megaton, Tenpenny Towers and Rivet City. Its arguable that the nature of the surrounding territory; higher radiation levels, a greater prevalance of super mutants and a higher incidence of savage raiders lead to a longer period of Mad Max-esque "everyone outside of our scrap-metal walls is the enemy" mentality from the inhabitants of the DC Wasteland.
The NCR itself, by the time of FO:NV has only existed for around 100 years, and had several advantages in terms of creating a new society - salvaged tech from Vault 15, stable and extensive farming. Fallout canon suggests a comparatively calmer and more peaceful socio-political atmosphere on the West Coast allowing for the growth of large settlements and trade in between them.
In short, both sets of circumstances are contrived by the desires of the game designers and they provide 'reasons' behind both situations.
Also, I'm not sure why you keep referring to New Vegas as being "50s baby Las Vegas," like somewhere, something in Fallout's extensive lore says "Las Vegas didn't become the sprawling metropolis of towering hotels, gaudy theme-casinos and laser-projecting pyramids" we see in the 20th Century. There's nothing that suggests Vegas was a small city, or remained time-locked in its 1950s state/size.
The New Vegas we do encounter is not overly impressive and its surrounding ruins, compared to the desecrated familiar landmarks of the Capital Wasteland, are mostly crumbling tarmacadam and twisted flyover ruins. It would've been amusing to have seen the ruins of say, the Pyramid or Caesar's Palace - even if only as objects protruding from piles of rubbles.
Now, I'm not going to suggest that this makes either game superior/inferior to the other, but the argument of "its a desert you don't find buildings higher than one or two storeys very often" is a flawed one.
OT: I liked the Hardcore mode in NV a lot. At least in concept. In practice I liked it a bit less since just adding three new meters to the game and giving Hydra and Doctor's Bags an actual function wasn't that awesome in terms of adding immersion to the game, but it was fun to have to actually sleep from time to time and it did mean that many objects that were effectively useless in non-Hardcore finally did something other than clutter up my PipBoy's inventory.