I agreed with the Guardian's core point, especially their argument that it was with Mary that the show lost its way.
I compare the scene where he, for no good reason, decides to physically take on the criminal single handedly in a 007 action sequence rather than call the police, to the scene in A Study in Pink where Sherlock meets the cabbie in a game of wits, wanting to solve a puzzle even if he has to stake his life on being right. I can't help but feel the character and what made this show special has got buried under the razzmatazz of being 'event' TV.
I don't know if it's the core point of the argument - but I found myself agreeing that one of the basic points of Sherlock was "brainy is the new sexy". And that definitely got lost with season 3, TAB and TST (even if I like the humanization of Sherlock but not at the expense of what made the series special - and Sherlock admitting that he makes up facts or deductions doesn't help there, either).
I think Mary could have worked if they hadn't spent 5/6th of season 3 on absolutely irrelevant stuff. There's just that "liar"-deduction when Sherlock first meets her, but the rest of TEH and TSOT is more or less playing with the fans with little to no content... which relates back to the lack of brainy. The problem rather is that the other core element of the show is also totally missing, the relationship between John and Sherlock which was absent in TST.
I didn't mind the action sequences because, as you say, there have been such scenes before: ASiP, TBB (where Sherlock fights in Baker Street), so that's not really unusual. Sherlock almost always takes things into his own hands and doesn't call for backup...
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