Humph. Color me unimpressed. Interesting concept, not so well executed. I'll believe that it was impressive when published (and the general populace still respected Freud when it was written), and maybe I'm too much of a Holmes fan (and too much of a Holmes/Russell fangirl).
But it felt to me from the beginning that Meyer didn't have any new ideas, and it just rankled me; the way he seemed to make excuses for why his book doesn't read like Conan Doyle, and kept pointing out allusions to this or that Holmes story. 'Nudge, nudge, See! I read the original, and all these other books too! Aren't I smart!'
I've never read a chase scene that was so... slow.
Besides which: SPOILER*********
He kind of halfway tries to make it fit with the story (Final Problem/Empty House) as written, by saying that Watson wrote those to cover the real story (cocaine induced dementia, soul-searching holiday).
However, if you're going to write Moriarty out of the Holmes canon, you better have a damn good story to replace it, and he doesn't.
*Nitpicky Sherlockian Alert*
ALSO: It doesn't work. The explanation at the start of The Final Problem is that Watson writes the story to explain what happened to Moriarty, since his brother "defends [his] memory [with].... an absolute perversion of the facts". If we were to take The Seven-Per-Cent Solution as true in world, then Moriarty, despite being a jerk, is not evil, and ALIVE in England. Why in the world would Watson write a story accusing an innocent man of being a criminal mastermind? It doesn't make a bit of sense. If he were to write a story to "cover" Holmes' disappearance, he could have written anything! Meyer says that Watson wrote it, but never why, other then to 'cover' the true facts and because Holmes makes a joke on the last page. Humph.
*End Nitpicking Alert*
Finally, the part where he's actually getting over the cocaine addiction is BORING, and the mystery that pads out the second half of the book is too. Sigh.