This isn't a flashy episode, but it is very well-executed and acted. Martin Balsam is always a joy to watch (appearing in many Hitchcock productions as well as 12 Angry Men), and the supporting cast all play their roles perfectly as well. I do wish more emotional weight had been given to the scenes between the husband (Balsam) and wife (Crane), but there is enough narrative to follow along.
I'm rather shocked -- though mostly amused -- at how all of the reviewers who gave low ratings (and even a couple who gave decent ratings) completely missed the meaning of this episode's ending, despite it being spelled out in the dialogue. Let's just say that "the equalizer" refers to THREE separate things in this story.
The irony and resolution would have hit a bit harder with some script rewrites to punch up the dialogue, but it carries weight regardless -- at least, it does if you're familiar enough with literary techniques to pick up on it.