I think having a character with a background, with a history adds to the story. Fallout 1&2&3 all did that. Fallout 3 most of all as the tutorial is you growing up.
But in New Vegas the Courier feels... empty. You have no past, no history your just some guy doing stuff like in countless FPS games. In an RPG I expect to have a character.
What Vegas really lacks is a Three-Dog someone to really report in what your doing. Mr New Vegas might as well not exist as he barely reports on anything someone listening to his broadcasts would have no idea all those things were done by the same person.
Fallout 3 was better open world simply because there was stuff to find in that open world. More unique weapons, more skill books and all the bobbleheads. I don't think Obsidian counted on the upside of having enough skill books to max out your skills. It gives the player something to do. New Vegas may have been better if you had to find the implants before you could get them. Instead of caps you had to find the implant then the autodoc or something would put it in.
Indeed, may I remind you(ben) that in FO1 you could side with the master and be Dipped? You also get to see the ending where you see V13 get overrun by SM's.
FO3 was the odd man out in the game series right next too BoS.
May I remind you that in Fallout 2 you couldn't side with the Enclave either so how does that make FO3 the odd man out. If anything fallout 1 is he odd man out in being able to side with the primary villain. But wait in fallout 3 you could surrender the code to the purifier to Col. Autumn that be step one in joining the Enclave right? but he kills you give the correct code ending the game. So siding with the bad guys ends badly in either game.
That doesn't matter, they still screwed over Harold.
As I recall in Fallout 2 Harold worries about Bobs continued growth. His fate in Fallout 3 may have been planned before Bethesda took over.