I'd give a solid 10 to this show but they ruined everything on Season 4. As long as you don't watch Season 4, if you can stop yourself from doing it, the show is absolutely stunning. Reasonable explainings which we can't usually find in crime series, nice characters with different characteristics, stunning soundtrack choices and of course Bennedict. Everything is perfect till you watch Season 4. I wish they ended the show with the episode "His Last Vow" I'm sure not sure if I want Season 5, Moffat will ruin everything again.