They certainly have filled the title role perfectly. Steffanie Leigh projects that sublime air of sweetness and superiority that earned Andrews the Oscar in her movie debut (after having been passed over for Eliza in "My Fair Lady," the role she created on Broadway). Leigh's Victorian nanny is both gorgeous and mystically crafty, a sort of ethereal being, deftly capable of turning all things right in the end.
She has her work cut out for her. The new children in her charge are a bratty pair — Camille Mancuso and Marissa Smoker share the role of Jane while Talon Ackerman and Tyler Merna divide the part of Michael. Whichever pair performed on opening night, they were strongly effective.
Fortunately, Mary has a little help in the person of chimney sweep buddy Bert (Nicolas Dromard), who assists in the creation of fantasy sequences and keeps the show's pace humming. He also headlines a swiftly choreographed number with his fellow sweepers ("Step in Time") which is quite enjoyable, just as long as you don't care to discern the lyrics.
The kids' parents are particularly well played by Laird Mackintosh as a stuffy banker who's long lost his sense of fun and Blythe Wilson as a cheery lady who's willingly given up a show business career to raise his children. You'll wonder how these two ever got together in the first place.
Where the show runs a bit off the rails is early in the second act when Mary has departed and a new nanny — the "holy terror" Miss Andrew, who was the father's guardian — takes over. The sequence illustrates why the dad is so dour, but serves no further purpose apart from adding a monstrously showy cameo for Q. Smith, who also takes on two other roles.