Season 1 and 2 were overall pretty well done; except The Hound of the Baskervilles which was bad. Season 3 started badly and went straight into the toilet. I won't bother making spoilers by elaborating, but I'm sure Arthur Conan Doyle is spinning in his grave. After reading other reviews I doubt I'll waste my time watching Season 4. It's a shame; because it was a good idea.