He also commended Duff's vocal style in the song and remarked that it would "put her singing career on par with her hyperactive acting endeavors." The song received generally negative reviews from critics, who labelled it repetitive.
Gabriel Leong of MTV Southeast Asia started the review by writing "A greatest hits album seems a tad flagrant when you've only had two albums so far.To promote the album, Duff embarked on a worldwide arena tour.Entitled the Still Most Wanted Tour, the tour—an extension of the Most Wanted Tour (2004–05)—began on July 12, 2005 in Los Angeles, California at the Greek Theatre, with a United States leg.Most Wanted also contains 10 previously released tracks from Metamorphosis (2003) and Hilary Duff (2004), as well as songs from soundtracks of Duff's films: The Lizzie Mc Guire Movie (2003) and A Cinderella Story (2004), three of which—"Come Clean", "Rock This World" and "Why Not"—are in a remixed form.Duff initially sings about the consequences of her fame and how people think they know "everything about [me]" ("There's people talking / They talk about me / They know my name / They think they know everything / But they don't know anything about me").
As the chorus draws near, the song takes on a "party anthem" approach, where Duff discusses the "struggle" for joy and self-confidence: "I know I make mistakes / I'm living life day to day / It's never really easy but it's OK..." According to Duff, the song "makes you want to forget about all the pressure of dealing with your boss, or your teacher, or your mom, or [whoever]," and lyrically discusses "getting out and not forgetting to have some fun." The version of "Girl Can Rock" featured on the album, according to Anthony Miccio of Baltimore City Paper has a chord progression similar to the song "Cherry Pie" by American band Warrant.