Mike, I'm frequently at a loss to understand why some people find other people attractive. I don't see why men go ga-ga over Heather Locklear, for instance. It's not a gender thing; I am equally befuddled by the prevailing opinion that David Duchovny is sexy. Small eyes, big nose, soft white body. Likable, but not sexy.
But I am firmly in the camp of Avon/Darrow admirers. If your wife can see his appeal just from still shots, wait until she sees him in action. Blake's 7 is available on video.