first and foremost, lets get it out of the way. after the material of Sherlock Holmes became public domain, scripts were being thrown around everywhere, and we could have had yet another Victorian era traditional "sleuth" story, and instead we were treated to a contemporary take that wasn't terrible. the writing and pacing are in bounty enough to keep you interested throughout the hour and a half run time, but it lacks something, something only a greater man than me could place.
something about the modernisation didn't make it, back in 2007 the bbc did a series called "Jekyl" which brought the Jekyl and Hyde story into the 21st century, and did it quite well, acknowledging both the history of the characters and co-existing with the book and the legacy, with this world, i couldn't imagine it existing without Sherlock Holmes being part of pop culture for over a century.
overall not bad, definitely worth a watch, but on iplayer only, not really much re-watch value until they finally get round to writing the next series, which, looking at the high viewing figures and cliffhanger ending, seem oh so likely.