whenever NO.
I am in two minds about this.
Yes I also got all the interwoven bits from the original stories like the Sussex Downs house with the beehives and the Opium Den from The Man with the Twisted Lip. Plus Holmes did get engaged to the housemaid I think it was, in the original Master Blackmailer story in order to find out about his habits and the layout of the house, much to Watson's horror so yes, he really was that calculating and emotionally cold.
BUT
I think they are making Holmes look foolish.
Holmes would never ever have shot a man in cold blood. He was not a criminal.
Also, whilst he was not infallible, he would have sussed Mary from the start. Same with Magnussen, he would have known there were no actual documents and that the guy had a photographic memory.
He would never have done a 'deal' with the Master Blackmailer or anyone else. He would never have put anyone in danger or compromised the government. Ever.
So I think they have done the character of Holmes a great injustice there and made him look extremely foolish, which has annoyed me. Holmes didn't always get it exactly right first time, but he never ever presumed, he only ever dealt with facts and evidence and if not one person had seen any documents this guy had, then he would never have risked what he did for them.
I actually found the 'How to be Sherlock Holmes' episode on afterwards to be far more interesting and I appreciate how Moffat and Gatiss have taken not just inspiration from the books but also from the films.
HOWEVER
Another bugbear is that they are taking great liberties with the other characters too. Mrs Hudson was always just a genial landlady with no sinister background whatsoever.
Mary Morstan died at some point, leaving Watson a childless widower who went on to marry again.
Moriarty remained dead. His network of criminals may have carried on their operations (The Red Headed League gang was one of them) but the master criminal was not resurrected.
As far as Doyle's belief in spiritualism is concerned, he never wove this into the stories. He believed in contact with the dead, but it didn't go as far as actually bringing the dead back to life.
If Moriarty is alive and Mary goes on to have a baby then this would be a huge depart from the original stories and characters.
I do appreciate them bringing Sherlock back from the confines of Victoriana and in resurrecting interest in Holmes and the books (which I think should be on the National Curriculum) but they have taken so many liberties with all the characters that I now feel they are far removed from Doyle's vision which leaves me bitterly disappointed.