Leah Libresco tries to explain why the spate of anti-religion books sometimes seem like intellectual snoozers:

I won’t deny that the New Atheists are going after the intellectually easy targets, but that’s because the anti-intellectual evangelicals are much more politically threatening than the Aquinas-reading theologians.  We have to fight all of them on gay marriage, but it’s the boring ones who tend to make trouble when it comes to evolution, global warming, and medicine (HPV doesn’t increase promiscuity, btw).

Since we atheists think we’ve only got this world, we focus more of our efforts on the people who we think are actively harming themselves or others.  Plus, a lot of the most active people in the movement (the scientists under threat) have backgrounds that are much better suited to rebut the anti-empiricism crowd.  (The crash course in evolutionary biology in The God Delusion is good, the rest is more meh). 

"Ask Andrew Anything" take on the New Atheists here.