The single most aspect of failure in Fallout3 certainly wasnt the graphics or atmosphere, but Diplomacy.
What is meant by that is in Fallout 1 and 2 you could create a high charisma, high intellect character with no weapon skills. You could win the game only killing about 10-12 monsters. It was very difficult, but could be done if you planned it out right. Dialogue options didnt GIVE you quests, they could END them. In fact, you could make more experience points by talking them out and picking particular dialogue lines than if you fought your way to the goal.
I know the makers of New Vegas understand how this was a wretched shortcomming of Fallout3 and how Fallout3 was not fallout3 but like Fallout: Some other game. HOpefully, New Vegas will be Fallout3. I would be satisfied even with Fallout: 2.5 even at this point.
Also, you could have more than 1 person in your group. I had 6 characters in my group in Fallout 2. 5 is the max plus a wife, Miria. She wasnt very good, but with 4 other heavy fighters and my guy as healer/wimpy, she survived quite a long time. You could play as a group leader/general type which only healed others or ran away from unnecessary fights. The Outdoorsman skill made you able to choose to NOT fight random encounters in the wasteland. So, tagging this skill would be good for a Diplomatic character.
In Fallout3, I added a level of Int, used the +skill point per level perk, took the +2 skill points per book read perk, and wound up getting 80% or higher in all perks. The max was 100. There was no room for creativity as I was highly skilled in.... everything!! (really dumb for an rpg, right?)
I hope diplomacy is there in New Vegas. The average age of computer gamers is 33 years of age. Not 12.