I enjoyed this one a lot...good characterization and a nice Trek story. The characterization is good because it hold true with what is already established about the characters but they are not exactly the same as they were; I can believe that the TNG crew would have evolved into these people.
Not bothered by the swearing. It's a silly criticism.
Shaw's monologue was great...I have one small quibble with it. Shaw, like all of Starfleet—especially, senior officers—should know how the Borg work. They should all be familiar with their methods and how unstoppable they were early on. He has to know JLP wasn't responsible for his actions, right? I can totally buy PTSD and I can totally buy survivor's guilt. It would be more believable for me though if there was a line to the effect of, "look I get it wasn't you but when we saw Locutus it was your face and I still see Locutus's when I look at you and maybe that's not fair but I can't get past it."
I am not sure how Jack will connect to the rogue founders (or whatever we're calling them). It seems odd for the big bad to be a DS9 thing? Picard and the Enterprise were conspicuously absent from the Dominion war arc so to choose them as "the thing from the past that comes roaring back with big complications and huge impacts for everyone" is a slightly odd choice to me but I'm willing to see where it goes.