The mixed bag of companions (with their own quests). Nice for changing things up for mulitple playthroughs.
Weapon mods. Weapon mods. Weapon mods. (I'd love to see more of them)
Crafting
While I loved FO3, I didn't like the time spent in vault 101 as a kid. I appreciate the brevity of the starting scenario in NV.
To avoid spoilers, I'll just call it the thing that you pull out of the water for the old guy. That thing completely made the ending for me on my first run.
Putting on Boone's beret... Wow. I even knew it was coming and it still got to me.
Did I mention Dinky?
