Who is KK Downey? has received mostly positive reviews. Fred Entertainment gave the film a positive review claiming that the film "(gives) more laughs per 90 minutes than your average Saturday Night Live show." Exclaim! called the film "easily the funniest Canadian film to hit screens in decades." The Globe and Mail gave the film three stars and referred to it as "rude and blessedly tasteless, without any sense the creators have any agenda except to be funny."
