I really don't see what the point of this series was. It was just shit. I wouldn't have minded them going for a plot that carried through the whole series if they'd actually done it well.
Episode 1 should have wrapped up how he survived the fall/faked his death, and instead all we got was John going "I don't care" and some half-arsed explanation to that beardy bloke. Even the beardy bloke had unanswered questions about the apparent method used, never mind what the audience thought. So either the way he survived was really shit, or they still haven't told us. If what he told El Beardo Weirdo was the truth, then basically he faked his own death just for the sake of pissing off John, because he revealed that Mycroft managed to sort out the assassins anyway.
The 'plot' of episode 1 wasn't really a plot. It was just some stuff happening. The whole terrorist, train bomb thing was apparently down to one bloke in a hotel, which served no further significance to anything. The actual disarming of the bomb was incredibly easy, and Sherlock, after revealing to John that he faked his own death for the hell of it, used the opportunity to wind John up some more. Oh, and Mupert Rurdoch arranged for John to be kidnapped and put into a bonfire to see if he was Sherlock's pressure point despite that being pretty obvious to everyone anyway.
Episode 2 was a load of sentimental guff and a load of random shit that was all conveniently tied together by an extremely huge coincidence. As with Ep1, it basically took no effort on Sherlock's part to 'solve' the mystery, and again stuff just sort of happened.
Episode 3 had Sherlock randomly off his tits in some abandoned house, apparently on a case, but this wasn't at all revisited. It didn't properly reinforce that he has a drug habit either, because they had both Sherlock and CAM saying that it wasn't a real habit. Then there was the whole Mary thing. She saved Sherlock's life by shooting him, or something, despite him actually dying and only saving himself by thinking about John. They revealed that Mary wasn't just ex-secret service, and was in fact a gun for hire and a murderer. Despite this we're supposed to accept that she's all cool and that John forgiving her is perfectly normal. Sherlock again didn't really solve anything and sorted everything out by shooting CAM, but then had absolutely no repercussions for this because a dead man wasn't dead. Before what was supposed to be a fatal mission, following an episode that fell just short of Sherlock and John making love to each other, they didn't manage more than an awkward handshake and Sherlock saying Mycroft was a shit brother growing up.
Going back to Moriarty not being dead, if he's not dead, then presumably he's still got some sort of network going on. And if that's true, then what the feck was Sherlock doing when he faked his own death? Not only was Moriarty not dead, whatever Sherlock dismantled clearly wasn't done properly. If Moriarty isn't dead, then what the feck is going on, and why did we see him in the post credits scene? Considering the big cliffhanger they left everyone with at the end of S2 was very disappointingly dealt with, I wouldn't be surprised if this new corner they've written themselves into isn't just as disappointingly dealt with, if not more so. Moffat's not even got the tired 'paradox' fix that he's used countless times in Doctor Who to save him.