I have the finest of scientific proofs! Backed up by my own opinions.
You see, there were some US TV series that crossed the color barrier. In other words, shows that started in black and white then transitioned to color. And the writing on these b/w episodes is much better. Such shows include Hogans's Heros, The Fugitive, Bewitched, Lost in Space, and others.
Even the first season of I Dream of Genie was in B/W, and it was a surprisingly inteligent show — compared to what it became.