The Guardian described it as being a "funny and typically meaty mystery from Steven Moffat". But Pat Stacey, writing in the Irish Independent said, "Probably the most foolish scene of all came in Tuesday’s finale when Mary threatens journalist Beth (Lydia West) . +more with a breadknife while making 'whoosh' sounds. This nudged Inside Man into full-blown sitcom territory. Strange, that, since Moffat seemed to want to say something serious about human nature and people's capacity for violence. " Anita Singh of The Daily Telegraph said, "Moffat can throw any amount of good lines or clever little plot twists into this show, but it is built on a flaw so fundamental that it's impossible to get past it. ".
The series features Steven Moffat's own son, Louis Oliver, whose performance was described by Radio Times as "show stealing".