I personally really like it, but I am a big fallout fan. The map is massive. I played the beta and picked up the full copy last night & I have never teamed up with anyone. You can absolutely play it as a lone wanderer if you want. I would be interested in playing in a team with Texagers, but I won't go out of my way to join up with randoms.
It is true that there are no NPC's. They fill that void with notes and holo tapes so you have to listen/read those to piece together the story on the factions and why they are all dead.
Xbox: Texag03