1- Completely disagree. There is nothing interactive in TES games. It's all window dressing. Unkillable NPCs. Nothing you do matters at all. No characters that have any depth. That is the opposite of interactive. And they are both equally "open". You can go anywhere you want in both series.
In TES/Fallout 3 the areas and characters feel like they have more to them than a single role in a quest. For example, freeside is supposed to be a big and populated slum, yes? My problem is not that there are too few people but they only used up only the half of the explorable area, the rest feels empty and until a certain quest they remain so then suddenly they become important for that one quest never to return there again after that.
And, it wasn't F3 or TES that is well known for their Invisible walls and convinient long paths around high level areas...
2- Uh, that's part of the lore and the whole point. New Vegas was spared from the brunt of the war by Mr. House. There are many almost untouched areas in both 1 & 2 as well.
If you had played the first two fallouts, you would know that NV was more of a Fallout game than 3.
The world moved on, espcially in 2, and started rebuilding new societies. 3 didn't even make sense - it was many years since the end of the world yet everyone was still eating old pre-packaged foods and living in [censored]hole dumpsters.
Oh, I played the original games, that's why this issue bothers me.
Even in Fallout 2 where rebuilding has started, peaceful civilization was still an exception, not a rule, there were caravan routes and more travel but the areas between cities were still barren and dangerous.
Not in the case of New Vegas where the opposite is true. You hear how both in NCR and the Legion areas are well defended, peaceful and thriving, only New Vegas is somewhat of an exception because it's a warzone.
That's fair and makes sense, but this is not a Post-Apocalyptic setting. Where are the ancient ruins, where are the untouched technologies, where are self-reliant people living on what they can find, where are the people who found something from the old world taking advantage with it?
Most of the ruins in New Vegas are recent, mostly caused by the war with the Legion, there's no much sense in exploring ruins because nearly all of them are already looted if not rebuilt
Fallout 3 might not make full sense, but it did it so this sense of being in a "destroyed, savage world" remains.
I mean, what would happen in a sequel? Half of america is already civilized and the series won't leave the country, walking around the rebuilt NCR areas are hardly interesting or "Post-apocalyptic".