In the following two videos John Dickson provides some important observations about the quality of the scholarship he's seen from some of the New Atheists. His question becomes "If in areas where I can check there scholarship and it proves wrong or they are misrepresenting things then how can I really trust them in other areas?" The first video focuses on minor problems while the second focuses on some of the bigger issues. Both are worth watching but if you have to choose only one pick number 2 (it's only 8:24 minutes long).
The New Atheists questionable history part 1 from CPX on Vimeo.
The New Atheist's questionable history part 2 from CPX on Vimeo.