I'm continually impressed at how the writers and actors get the characters so right, something that I didn't think was quite so true in Guy Ritchie's first film, especially Adler. Adler's still more amoral here than in the original story, I think, but Holmes's attraction to her was certainly was portrayed better than in the film, and done in a much more subtle way.
And it's funny to think: 18 months of waiting for more Sherlock and nothing, then all of a sudden, a sequel, a 2nd series, and a new novel turn up at once! (The novel, in case you haven't read it yet Bev, is incredibly good, from what me and Pond have read so far. Again, it gets everything spot on, from the characters to the writing style to Victorian London. Marvellous stuff.)