There's a huge difference between being a believable setting and being an interesting world to explore. New Vegas had many more "major" locations, and they were all a good deal more believable than Megaton or Rivet City. However, the locations in-between them, the places that didn't involve quests, were horrifically boring. It probably helped that Fallout 3 didn't have many quests, so many of the interesting locations were just there for you to discover on your own. I've said it before, and I'll say it again, New Vegas should have had a linear environment. It would have been such a better game if we didn't have to deal with Obsidian's half-assed open world.
NV was ok, I feel it should have been divided more, my issue is how little of the legion you see, I think it would be better if legion had one half, ncr had the other, the middle is no mans land and the strip, also the strip needed more everything, npcs, activities, quests, big buildings, I dont know how others felt,m but I think the strip felt far too small, especially considering this was spposedly a hub, an amazng economy, with ncr and natives drawn in.
Vegas was dissapointing in that regaurd.
I think Obsidian shoudl do a DA/ME style game, where the world is divided into small sections, it can give the illusion of feeling big (ME1 did that imo) but not have any of the issues like bland places and parts just feeling wrong like NV did.
Better luck next time Obsidian.
I hope they get another chance, their writing and atmosphere are better, and those 2 alone make a great game, look at bioshock for an example.
Went off topic sorry.