From The Metropolitan Opera website:
Luisa Miller represents a transitional moment in Giuseppe Verdi’s unparalleled career. While reminiscent of the youthful vitality that had made Verdi an international sensation, the opera also looks forward to the dramaturgical discipline and sophistication of the composer’s middle period. The story centers on the bond between a father and his daughter as they stand together against a hostile world, and much of the dramatic and psychological acumen that would define the mature Verdi is already fully apparent in this earlier work. It is an opera very much like its title character—one that impresses with genuine virtues rather than superficial flashiness.