NV BoS was, imo, the writers trying to set the record straight about the fact that the BoS is just another tribe, and has no unity of thought, just unity of survival. Sometimes people with power and numbers choose to do good, and the definition of good changes with context. The only reason they have any cohesion across decades and locations is the fact they wear the same shit and use the same hierarchical structure and designations. Otherwise they're distinct tribes with distinct motives, circumstances and leadership, and seemingly no overlap with other sects other than their shared knowledge, access to high tech, and burning design to aquire more. Those that do have communication/cooperation with other sects are just larger tribes essentially.

So was NV BoS "good"? Elijah could've held Helios 1 imo, even if it cost the sect half or more of their numbers. He would've caused a lot of suffering for the Mojave with that power. McNamara perhaps didn't know that, but he knew Elijah had gone crazy and wasn't going to watch him sacrifice their sect for power. He stuck true to BoS philosophy there. Hiding and refusing to use their resources to help the Mojave wasn't exactly doing good, but McNamara was keeping his people alive and trying to make the best next move possible. I don't think NV BoS really applies to this criticism since the best good they could manage was to keep Elijah was bringing the second apocalypse to the Mojave. Failing to branch out and aid in other ways is hardly a moral demerit.

Imo NV BoS is just lame, perhaps by design. The scout teams all died...and you survived these locations, alone in some cases, without power armor. Repconn is just sitting there full of tech and rockets ffs with only some ghouls and muties in the way. The BoS probably could've retrofitted a rocket into a guided nuke to send to Caesar's tent. There is all this power sitting around the Mojave that even the player can't make full use of, yet seems the only one capable of securing it. If the BoS found the Big Empty??