So many seems to think that Fallout 3 is meant to be our future, but it isn't. It is an alternate timeline that diverged from ours at some point in the 50s, where in the 50s style never died out. Others have mentioned this before, but they haven't yet mentioned that the laws of physics in Fallout are also different. Their based of what the 50s thought of nuclear energy and radiation. To them radiation made things grow large, vicious and crazed, the whole Godzilla thing, despite the fact that we know now that all radiation really does to a living thing is kill it. Many things that we understand about nuclear war, such as nuclear winter, were not developed in the 50s and thus are likely to have not occurred at all.
Moving on, I agree with some of your point on the lack of factions to diversify things, but by the late game there are some factions you can join through your Perks, the Lawbringer perk if you are Good and the Contract Killer perk if you are Evil. They don't add much to the story or gameplay, but they are a nice touch.
The voice acting in Fallout was far superior to Oblivion, not least because it feels like you can count the number of voice actors in Oblivion on one hand. Fallout had a greater variety of voice actors, and lacked any 'Begger' syndrome, although both suffered from poor character animation.
Moving on, I agree with some of your point on the lack of factions to diversify things, but by the late game there are some factions you can join through your Perks, the Lawbringer perk if you are Good and the Contract Killer perk if you are Evil. They don't add much to the story or gameplay, but they are a nice touch.
The voice acting in Fallout was far superior to Oblivion, not least because it feels like you can count the number of voice actors in Oblivion on one hand. Fallout had a greater variety of voice actors, and lacked any 'Begger' syndrome, although both suffered from poor character animation.