Yes, you're forgetting the entire Benny storyline. New Vegas has a factional based main quest, the idea that it's poorer because it cohesively weaves the entire setting into it is quite alien to me. The opposite turns me off, I feel. The worst example being Skyrim, I kinda liked walking around and doing stuff in the world but the main quest was so removed from anything that gripped me to the setting that I didn't care. It felt like some dutiful chore calling to me. In New Vegas, the worldbuilding and the detailed setting pull me in, and the main quest is just as part of that because it's not your chosen destiny, it's your character being an agent of change in this regional conflict.