I quite enjoyed the episode. Not as much as series 1 and 2, but much more than anything since then, at least for the first half or so. After that, slightly less.
I am aware of Holmes’ principle that once you have ruled out the impossible, what remains, however improbable, must be the truth. (Of course with the Sherlock incarnation we can never be sure whether what we see is ‘real’, a dream, someone’s flawed recollection, or possibly something else altogether.) Here are just a few of my improbables.
Improbable that a young man would quietly die of a seizure and his body not slump even after rigor mortis wears off.
Improbable that the memory stick should have stayed inside the bust when whoever was in charge of finishing/shipping the ‘artwork’ picked it up. (And it does also seem improbable that super-ninja-agents would carry the memory sticks around anyway, but then maybe that's what they do.)
Improbable that Mary should wander the world, and without even checking whether the memory stick has been tampered with at any point in the last six years – after all, its owner is known to want her dead.
Improbable that a lone Moroccan policeman should happen upon an armed stand-off and immediately determine who is the bad guy and then shoot him without warning and using the kind of improbable bullet that, even at such close quarters, just lodges quietly in the victim’s body and does not inflict any further damage on persons or items nearby.
Improbable that John would text a woman who chatted him up at a bus stop (or was it indeed a dream, as someone suggested above?).
Improbable that Sherlock should call Mary and John to the showdown with a potentially desperate woman (and also improbable that said woman would pull her gun and shoot once the police have arrived).
But entirely impossible that someone could jump in front of someone else into the path of a bullet, or out of the path of a bullet, let alone one fired from a few feet away. (Another of those magic bullets, incidentally, that hit their target and then conveniently stop without inflicting any further damage or even causing more mess than just a rapidly spreading bloodstain in the precise centre of the target’s chest.)
So as it was impossible for Mary to jump into the path of the bullet, and impossible for Sherlock to jump out of the path of the bullet, we are left with a few more improbables: Moffat and Gatiss don’t know physics, or don’t care, or think the audience doesn’t know or care. Or, as Mary was the one who was (or appeared to be) hit, the pistol was in fact aimed at her. (Did she have information on ‘Amo’ that Sherlock and Mycroft missed?) Or the pistol was indeed aimed at Sherlock, and he was the one hit, only it was all a dream where everything is possible. Or there was no actual bullet – everybody just thought there was – and it was all yet another elaborate hoax, never to be cleared up satisfactorily.
(Now why wouldn’t that surprise me…)