Although the film received mixed critical reviews, many critics praised Shane West's performance as Darby Crash, often noting that West bears a strong physical resemblance to Crash. David Wiegand of the "San Francisco Chronicle" spoke highly of West, writing that even though some of the supporting performances such as those of Bijou Phillips and Rick Gonzalez are very strong, it is Shane West "who lifts the film to a whole other level" as he brings "multiple layers of insight and nuance". Carrie Rickey of the "Philadelphia Inquirer" wrote that West had a "terrific performance" and noted he also "bears an uncanny resemblance to Darby Crash." Nora Lee Mandel of Film-Forward.com wrote that "West is magnetic trying to fill the gaps in the pop psychology insight into how the Germs' brief candle burned out so fast." John Hartl of the "Seattle Times" wrote that "While "What We Do Is Secret" may not be remembered for much more than West's performance, it's an impersonation worth saluting." Phil Gallo of "Variety" praised both West and Grossman writing they both "have a clear, unwavering perspective on Crash that should entice curiosity seekers and old punks." Pauline Pechin of "Premiere" thought that West played Darby Crash to a tee and kept on writing in fact, his performance was so believable that he's currently on tour with the reformed Germs as the lead singer. Ken Fink of TV Guide wrote "Shane West does a pretty impressive impersonation of the on-stage antics of Darby Crash".