This is one of those debates where you really have to get into the details just to arrive at an informed position. I’ve read his rebuttal, but so much time has passed that I will need to re-read his book chapter (yes, I did read it), Barnes’ posts, and my commentary before I can even decide what to make of his rebuttal. Because of other commitments, it’s doubtful that I will be able to do that anytime soon. But that’s no reason not to check out his rebuttal for yourself, if you’re interested in the fine-tuning argument.
Update 17-Jan-16: Fixed the link.