Critics slammed Miley Cyrus in her first movie made outside her “Hannah Montana” character as it opened in US theaters Wednesday, but “The Last Song” was still expected to perform well at box offices. The weepy romantic drama, written by best-selling author Nicholas Sparks, was deemed melodramatic and formulaic and claimed only a seven percent approval rating on www.rottentomatoes.com. Cyrus, 17, was widely savaged for her performance as a surly teen sent to spend the summer with her estranged father. Lou Lumenick of the New York Post called it “the most dubious ‘dramatic' debut of any singer since Britney Spears” and took Cyrus to task for “displaying approximately one and a half expressions.”