I felt the OP was speaking mostly of atmosphere. I find the Fallout 3 area to be, for the most part, boring. There are no changes in weather and virtually no changes in scenery. I expected to have fun exploring a decayed city, but instead wound up exploring old subways over and over again. Subway crawling was neat the first few times but quickly became obnoxious. The whole place feels incredibly scaled down and crowded.
I much would have preferred a very large landscape with roads and vehicles. It feels more like your trekking through a wasteland when you have large relatively barren areas between all the big and busy places. In Fallout 3 I can't seem to take 30 or 40 paces without running into some place of interest or some sort of encounter. Really it just feels too small for all they were doing. I'd like to imagine the size of all the land in Fallout 3 to be the city part of the game and then have another hunk of terrain, the size of all we have now, being the rural wasteland. Add roads and vehicles and you have a kickass environment to build the game on. I'd like to think that so long after the war that people may have cleared some rubble to make travel through the city possible. I'd imagine they'd make use of some existing structures and form towns within the city ruins. I dunno, maybe that sounds dumb but I think it would be cool. You get tired of looking at the city you go to the rural area and vice versa. They'd both be plenty enough to explore.
The environment in F3 can get repetitive. There are a whole lot of rocks, rubble, debris, and some dead trees here and there. Very little variety in colors and textures. The impassible barriers of rubble make urban exploring incredibly lame. 'Walk down street, go in subway, dike around in subway for a while, return to surface, walk down street, enter subway, repeating repeating. I know it's supposed to be a wasteland. OK OK, so what could I possibly expect right? Just because it's a wasteland doesn't mean it all has to look the same and have a lot of impassible barriers.
How about a kickass wasteland forest to explore? Not full healthy Oblivion forests mind you. Rather, it could be the remains of an old forest in like some valley maybe the remains of a nature preserve or park w/e. Lots of dead trees and some new trees and bushes and other shrubbery growing in to fill things out. Make it big so it's like a whole 'nother area to explore. There can be all kinds of things in there. The big old wasteland forest can be oh so deliciously scary. Especially at night. Imagine running into yao guai in the woods or running into a creepy old cabin you make your home, there can be caves, vaults and other [censored], whatever man a lot can be done with this. I've seen more trees in the previous fallout games and they took place way before F3 right? How about a big frikkin desert? Great way to fill empty areas out and add to that large barren wasteland feel. Also, desert is the perfect setting for awesome road warrior type [censored]
I'm just saying I'd like to see a big neat wasteland to explore, with plenty of variety and for godsake some vehicles to help us travel around.
Gameplay issues are largely solved by excellent mods, but hardly anybody does anything about terrain. So while I might enjoy F3 after installing some mods, I can never say I love it as I will always be nagged by the environment.
Hmm that actually turned out longer than I expected.