Corbett is one of the best researched, level headed dudes out there. Not sensationalist, not politically biased, or even religiously biased. He documents his work so others can look it up themselves. And when he does speculate he always tells you he is speculating, and does so from a perspective that is educated on the subject matter.
He doesn't have the reach of some of the bigger names because he is less a media personality and more of a journalist. And for all those reasons I wish the dude would write some books.