What is the author's style in The Little Foxes by Lillian Hellman?

Throughout its stage life, The Little Foxes, full of high intensity and the relentlessly malicious Hubbards, has withstood the charge that it is a melodrama, that is, a play in which emotional sensation holds more importance than character motivation and psychological depth. At the end of a typical melodrama, good characters are duly rewarded while bad characters are punished for their foul deeds. Of course, the purposely unresolved ending of The Little Foxes, which was to be followed by a third play in the planned trilogy, does not suit the dictionary definition of a melodrama.