Here is a review of the original 1931 theatre Guild production of O'Neill's Mourning Becomes Electra. Please note the critic's closing lines -- "Be that as it may, “Mourning Becomes Electra” is an achievement which restores the theater to its high estate. It is an adventure in playgoing that no wise lover of the theatre will be so foolish as to deny himself."

http://www.eoneill.com/artifacts/reviews/mbe1_post.htm