It's no The Seven-Per-Cent Solution.
Generally, I have a high tolerance for paint-by-numbers investigation period dramas, Sherlock or otherwise.
However--and this is not this movie's fault necessarily--I am much more skeptical of Jack the Ripper stuff. And some of the murders in this were really violent! A strangling is always tough to watch, especially in the context of a Sherlock/Watson relationship that is so staid.
Just that being the driving mystery make the movie that could have been peak afternoon passing the time into something much harder to watch, without an accompanying pay off.
Sherlock/Watson being Friends From Work and more professional was actually pretty endearing and I liked Plummer and Mason a lot in the roles.
Sutherland's facial hair was also a hoot.