I never drew parallels between Gaye and Thicke, but then again, I haven't heard anything by Thicke other than that one song with the video people are in a tizzy over.
Great write up, I completely agree with the assertion that Marvin Gaye's singing is more enjoyable and approachable because of his vulnerability. Otherwise, his singing wouldn't be as believable. I don't believe Robin Thicke, but I believe Marvin Gaue.