LordoftheFlies - as a diehard Holmes fan I was determined not to enjoy the BBC series. I am very very particular about how Holmes is portrayed and having seen the appauling way in which Hollywood treated the character and the stories, I was pretty much disgruntled that the BBC should have a shot at plunging the knife in further. BC or no BC (I didn't even know how he was)
Yet I found myself squealing with delight at the cleverness of it all, the text messages, the way in which Holmes embraced modern technology and yet lost none of his powers. I loved the direct quotes from the books, the extra bits they would put in (such as the joke about the hat) for die-hard fans like myself. So for me, it was not BC who made this series so great but the writers. Therefore if it were not for Moffat and Gatiss, if they hadn't been such fans themselves, then I daresay I would have hated it as much as the Hollywood version.
Ok - Sherlock acting out of character?
When Molly said that he looked sad whenever he thought Watson was not looking. Since when has Holmes shown any emotion?
Since when has Holmes not noticed that someone else was looking? Holmes, ever observant - it is inconceivable to think that he would not know that Molly was watching. He looked sad for her benefit.
Mycroft reading The Sun, he said to Watson that there was going to be a big expose (sorry my keyboard won't do the accent over the e) written by someone called Brook, then he asked Watson if he had ever heard of him. He was deliberately drawing Watson's attention to the article and to the writer of the article.
Both Mycroft and Holmes would know that there is not a keycode that can open all the doors. Moriarty doesn't even use a keycode to get into the Tower, the Bank or the Prison. They knew all along and Holmes chose to walk into the trap that was set for him.
So the rooftop, the expose, it was all planned and Holmes knew exactly what was going to happen.