I played the new content for a bit yesterday. What struck me is how it hasn't been integrated into the existing gameworld.
For example, the BoS has some interaction with the existing factions. Of course they do. Only they don't. The interaction with the Crater raiders isn't with Meg, as it should be as she is the definitive leader of the faction. It isn't with Raf or Ae-Ri, which might make sense as an initial cautious approach to use trade to get a better understanding of the political situation (although that's not the BoS's usual approach to anything). It isn't with Johnny Weston, who would make sense as a diplomat from Crater to the BoS. It isn't with any of the existing Crater raiders at all. It's with new Crater raiders who are completely seperate from the existing Crater raiders and who exist only in a new instanced location.
The same appears to apply to Foundation, since when I stopped playing I had just been given the mission to make contact with Foundation and it was to meet a character who didn't exist before.
It goes beyond that, as well. There are no options to do anything other than join the BoS and be treated as a powerless nobody who hasn't done anything. But in the existing gameworld most characters are already hyper-powerful demigod-like people festooned with powerful enchanted equipment who have already transformed the area physically and politically, who already have huge influence with the existing factions, who have already brokered a truce between them and who have already saved the the whole of humanity from the existential threat of the scorched plague. And who, rather relevantly, are more powerful than the BoS in the area. Which is completely ignored. It's not even commnted on by NPCs, let alone acted on.
The BoS should be bit players who are probably not entirely wanted since they're destablising the delicately brokered truce in the area. And that's with their best approach, which isn't always used. They are inherently an authoritarian faction and in some cases don't give a damn about people. In some cases, they're just disciplined and hypocritical raiders. Which is also why Paladin Rahmani is incompetent - she's assigned Knight Shin to civilian outreach and he's the worst possible person she could have assigned to that role. My main's genuine response to Shin would have been to kill him. They're used to blunt and violent solutions to problems that threaten the area and Shin is a problem that threatens the area. But that isn't an option. Join the BoS? Why the hell would I do that? We don't need them, they're a threat to the area, they're less powerful than we are, they're not even unified, we have no way (in the context of the gameworld) of knowing which way they'll go (helping people or hoarding technology, looting ("requisitioning") resources from people and condemning humanity to decline and destruction by keeping them ignorant). Why would we voluntarily make ourselves subservient to them and give them our obedience?
So yeah, I'm not impressed with the new content. It's not badly done in itself, but it's very badly integrated into the existing game. It doesn't fit.