Oh my goodness what the heck I'm crying! That was so lovely!
Cons:
It sure would have been cool to get Natalie Dormer back as Jamie Moriarty, but I understand why they couldn't. A part of me wishes that a bit less of this episode had been focused on her, because it kind of set up expectations that she might make an appearance after all. Next to the looming specter of Jamie Moriarty, the random NSA guy just didn't pack much of a punch.
I absolutely loath the narrative device of showing a coffin and trying to fake out the audience as to who has died. They've done it on Arrow, they've done it on pretty much every procedural show I've ever watched... I'm sick of it. This one was particularly annoying because it dragged on for a while, with Sherlock and McNally talking about a nameless "she" who had died. Obviously we're supposed to think it's Joan, but it turns out it's Jamie Moriarty in the end. Sigh. This was obvious and they dragged it out way too long.