When Rodgers + Hammerstein's Cinderella, which first appeared as just plain Cinderella in a much loved television production starring the youthful Julie Andrews back in 1957, finally made it to Broadway this year, it received something of a mixed critical reception. Its book, revised by playwright Douglas Carter Beane, was bothersome to a number of critics. Cinderella had become Ella and a political edge had been added. There is a little too much 'schtick.' But if the critics were ambivalent about the book, most were not unhappy with the music and its performance.