I wasn't keen on the idea of a modern adaptation liking the Victorian setting so much. Don't get me wrong, I get what Moffatt says about the original books being about detective crime-solving not fog and gas-lights... but you have to admit, it creates a great spooky atmosphere doesn't it?
However, I thoroughly enjoyed it. It worked very well in the modern setting, while still retaining a slight Victorian flavour ... (Probably mainly due to the architecture in Central London hasn't changed all that much, but there was something in the tone too.)