by Mike Krumboltz " Sex and the City 2 " hits theaters on Thursday, and while fans of the fashionable foursome are likely to show up in droves, critics are urging moviegoers to lower their expectations. A lot. Roger Ebert of the Chicago Sun-Times gives the movie one star out of four and describes the four main characters as "flyweight bubbleheads living in a world which rarely requires three sentences in a row." In Mr. Ebert's view, the characters of Carrie, Samantha, Miranda,