There is a scene in Ethan Cohen’s Holmes & Watson where Sherlock Holmes, played by Will Ferrell, puts on a bad fake mustache and somehow fools Dr. Watson, played by John C. Reilly, into thinking he’s a completely different person. It’s not a great joke, but it’s illuminating. The filmmakers also seem to think that by slapping on a ramshackle disguise they can trick audiences into thinking Holmes & Watson isn’t just a pale imitation of Talladega Nights and Step Brothers.
But when Step Brothers and Talladega Nights would whiff a joke, both movies quickly moved on to a better one. Holmes & Watson is a collection of limp comic set pieces and repeated riffs on the same three gags: Joke A. The 21st century is different from the Victorian era; Joke B. Holmes isn’t as smart as he thinks he is; and Joke C. Blunt force trauma to the face.
Source: IGN.com Holmes & Watson Review