I don't dislike Ruth Gordon in her role, but HERE AND THERE she does overdo that kind of personality she became famous for, that "Harold and Maude" one. But my only real complaint is about a handful of her lines, and as far as I know she didn't write those (in spite of being a writer herself).
I agree with Peter. Shatner was my first choice as well. Hence, Fade in to Murder ranks prominently among my least favorite Columbo episodes. The only role he ever impressed me in was as Kirk in Star Trek. Otherwise, I can't stand the little runt.