I love this show. I love the BBC and Steven Moffat and Mark Gatiss, mostly due to Doctor Who. However, by the later seasons, similar to Doctor Who, the writers are so concerned with outdoing themselves that the plot begins to fall apart. I kept my rating at 8 stars because of how good the modern adaptations of Sir Arthur Conan Doyle's stories are (especially the Baskerville episode), but the later series definitely detract from the overall show.