Kathleen Marshall's revival of the 1934 Cole Porter musical doesn't do much to improve the silly shipboard-romance story, and a little too much to improve the already first-rate score (adding a couple of songs from other shows to a playlist that already includes "I Get a Kick Out of You," "You're the Top" and more). But she has come up with an ideal showcase for Sutton Foster, who slides with confidence into the role created by Ethel Merman, and puts herself at the top of an impressive new class of Broadway musical divas. Kelli O'Hara, your move.