OK, I’ll take a step back and start over and explain what I found unsatisfying. The episode has both told us and shown us that Magnusson is brilliant, a worthy adversary for Sherlock. He has his own mind palace. He’s a brilliant strategist and manipulator. He has his blackmail scheme that he has built up over years, and he has presumably used it to entrap and control dozens if not hundreds of powerful individuals from around the world, most of whom got to be powerful by not being fools themselves.
So, he’s going to have a showdown against Sherlock, and one of them is going to come out on top. And Sherlock, who is our hero, is of course insanely brilliant himself. So, this is gonna be good, right? Two titans pitted head to head. I’m eager to see who flinches first, what moves and countermoves occur, and what super brilliant plan one of them finally comes up with to take down the other.
And, although I have quibbles with various details of the episode, for the most part it delivered. Sherlock fakes (?) a drug addiction to give Magnusson leverage? Crafty move. But Magnusson sees through it! Crafty move. Then Sherlock deduces something that no one else could, which is that Magnusson has electronic glasses. Crafty move! But Magnusson was faking that all along! Crafty move. So Sherlock arranges a situation in which Magnusson will take him inside his house, giving Sherlock access to the Appledore vault. Crafty move! But it turns out that Appledore never existed in the first place, and Magnusson had all the blackmail info in his own mind palace. Super Crafty Move! [sub](There is a legitimate debate about whether that last bit actually makes sense or not, but it at least has the general form of a Super Craft Move)[/sub]. So, what level 18 ultimate UberCrafty SuperStrategy will Sherlock use to top that, how can he possibly defeat Magnusson who is now clearly holding every last card, who is so crafty that he has covered every contingency, out-thought and out-anticipated Sherlock at every turn, spent a lifetime perfecting the application of leverage through blackmail? What is Sherlock’s masterwork of planning?
Oh, right, it’s the most obvious plan that anyone could EVER COME UP WITH, the VERY FIRST THING ANYONE WOULD EVER THINK OF, and Magnusson, after this episode of insane craftiness, wasn’t prepared for it because, umm, reasons.
I agree that the “Sherlock is forced to actually kill a guy” side of the final move is an interesting one. But to me at least it’s horribly undercut by the “wait, Magnusson didn’t think of THAT happening? What a moron. All that supposed brilliance and THAT is what got him in the end?” stupidity of it.
Does that make sense? I mean, obviously you and I have very different tastes and preferences, which is fine, to each is own. But what I can’t figure out is whether:
(a) my analysis above is missing some key point, but one that was at least hinted at in the show, or
(b) there’s a very satisfying explanation which the writers know and had established, but they’re leaving it up to the viewer to figure out what it is
or
(c) you agree with me about the facts of what happened, but it just bothers you only one billionth as much as it bothers me