Considering the fact that I svck in any form of combat and that I'm not interested in it, I admire the work of the Followers of the Apocalypse. The scientists and doctors dedicate their lives to help the poor folks. In Fallout 1 it's in a lawless environment, (And in the highly dangerous Boneyard), and in New Vegas they strive to accomplish their goals despite the bad relations with the NCR.
In fact, I just completed New Vegas for the second time and... (Follower's ending spoiler ahead),
Spoiler I was angry that the NCR forced them out of the Fort and disbanded them. Bastards!
Otherwise, the Bishop family in New Reno are always a nice bunch. I make sure to visit Mr. Bishop's wife everytime I'm in town. With proper protection of course...wouldn't want an offspring now would I?
I didn't mind the NCR in Fallout 2. Maybe because they actually had a good president I was fond of. But in New Vegas, I want to hit some of their military superiors most of the time. I had a blast playing through the game as a pro-NCR cowboy though.