This episode confuses the hell out of me, because elements of it were kinda meh, and elements of it were among the absolute finest I've ever, ever seen in Star Trek.
As for the "plot" side of things, this episode is full of holes and kinda collapses upon further examination. Why did the advanced synths just up and leave as soon as the beacon was turned off? Why did Oh's fleet hesitate for so long? Where the heck did that mysterious fixing machine that RIos used actually come from? Everything is contrived to be railroaded to the exact point we end up at. Mind you, I don't think the railroading is any worse than Trek has done historically, but it's there. The plotting - while better than last week - simply isn't brilliant.
In the early part of the episode, I felt like things were building to a very predictable point. However, along the way there were tons of legitimately great character moments, things like the "fireside chat" between Rios, Raffi, Elnor, and Narek, that I wish were done more throughout the season. Narissa was given a tiny bit more development as an antagonist, which was welcome. I can't say the same about Oh - every single scene with her was awful, and felt ported in from another show.
The episode began its grand inflection point when it became clear the plan wasn't to end on a giant battle - that they were going to take the very TNG standpoint that the whole point is to avoid the battle whenever possible. I always maintained the only proper way for the season to end was if the stupid prophecy of the Zhat Vash was in error, and it looks like I was right. Those advanced synths may have been malevolent (they sure looked it anyway) but they are just one of many advanced races in Trek (with varying moral compasses), and the season ultimately made it clear that conflict between organic and synthetic is not inevitable - that we have a choice to make and do not need to relive the past.
And then, the epilogue - PIcard's death and resurrection - took an episode which was just average and made it so much more. Particularly the unexpected brief re-introduction to the real Data. It was emotionally manipulative as hell, but it worked in all the right ways, tied back in to the first episode, and allowed Picard's initial arc some sort of closure. While I have some issue with the railroading of the idea that mortality is an intrinsic good in and of itself, it was all scripted and acted so beautifully that I could forget it in the moment. Probably the most feels an episode of Trek has given me since The Visitor.
8/10.
One final note: Why was Riker wearing a hairpiece when he was an acting captain?