I watched it tonight, and I'd recommend it if you're looking for a break from typical loud Hollywood action-adventure or comedy. It was nice to see Hiroyuki Sanada, even if his presence was fairly brief. And someone should teach Milo Parker how to do a northern British accent, because in 10 years or so he'll be perfect for playing a young Mark E. Smith if someone wants to do a Smith/The Fall biopic.
I wonder what Arthur Conan Doyle would think of there being multiple versions of his creation extant in the 21st Century. He often thought of the character as a burden, even trying to kill him off, but I suspect part of him would find the continued fondness for the character quite flattering.