I've only dealth with the BoS in the Cambridge Police Station so far, and I haven't joined them or even visited them in their other location, so I have no idea what their current story is. But I see them everywhere. Almost every time I travel between locations outdoors or just when randomly exploring, there will be a vertibird or two nearby. And every time it ends the same: the vertibird gets shot down. It doesn't matter what they decide to attack; raiders, Gunners, super mutants - they might manage to kill one or two of these, but within seconds the vertibird will crash and I will have to do clean-up. With all that firepower, all that technology, the military discipline, and apparantly an endless pool of recruits, they can't seem to manage shit. It makes me wonder how on earth the eastern branch has survived this long, and it makes me wonder how they have managed to come across all that stuff when even a bunch of raiders with pipe guns seem to outsmart and overpower them. And it definitely has me thinking that all this pre-war treasure should be in the hands of someone a bit more capable, and that the BoS of the east might be the most dangerous thing to happen to the wasteland since the bombs fell.