Vault11
Banned
I'm not saying that the Capital Wasteland couldn't have been more filled, but I just hate deserts in general, you can't do anything imaginative with them, they are just boring deserts that go on forever with nothing in sight until you (in the case of FO:NV) reach a settlement or a landmark, the Capital Wasteland felt more genuinely post-apocalyptic and had an overall creepier and better athmosphere with the ruins of DC and the surrounding Virginian and Maryland countryside providing backdrop to the dense urban environment of DC; you can do more with that then endless desert.
There's a lot more to deserts than you think (I live in the Chihuahuan desert) and not only are they teeming with landmarks and life, as much as any forest or swamp, but they are also very beautiful. I think New Vegas captured that very well, and 1 & 2, to an extent. I would never use "boring" and "desert" in the same sentence. And for the point that Fallout 3 felt more post apocalyptic, that's a failing of mmaintaining the spirit of the originals. People were building cities with basic concrete and steel structures back West, yet towns like Megaton, giant tin shack hovels made by peasants straight out of a Monty Python skit? Might as well have been stacking mud, they sure weren't farming or hunting. I dunno.