I missed out on the first episode of season 2 - the one that involved Irene Adler as a dominatrix (mmm?!) but the next two I did see and they were amazing, great tv. The scripts are as good as in the first series, almost flawless, with lots of small touches, and believable in terms of the characters. The acting, sound and camera work are wonderful too. I love it that Sherlock doesn't highlight and write in big type, it expects its viewers to get it and to think for themselves, and so many films and tv series today do feel they have to push things into the obvious (The Tudors seemed to write things in capitals and make the characters trumpet at us all the time).
Reichenbach - yes, I would agree that was a very tough watch, at least the final tthirty minutes. It becomes tragical because it's so close to how the media function today, and how some of the media community live off hyping people up and then tossing them into the dirt. You can't watch Sherlock being challenged by his adversary and by the media without thinking of the Murdoch/NewsCorp scandals, the coverage of Tiger Woods' marriage breakdown and time-out, that kind of thing.