Storywise? A resounding yes.
Cast? Aside from the two leads, adequate.
Production values. Fair. The sets could have been much better. And why not sepia tone?
Although one of my most favorites that I watch continually, I can't help feeling it is rushed. I would never tell anyone not to watch this however. It should be required viewing.
I may be twisted, but I'm not miserable.

Judgment at Nuremberg.

I saw this film only earlier tonight and I can't stop gushing about it.
However, his follow-up movie and fellow courtroom drama, "Judgement at Nuremberg" (1961), is his greatest masterpiece.
Ribbons and detours meant nothing to me
Swaying our sympathies, pulling our strings

I usually don't think of Kramer as too "cinematic" a director, but there are some very subtle camera moves and dissolves here that rank with the masters.
"May I bone your kipper, Mademoiselle?"