I always thought the anarcho-capitalist crowd (which includes Milton Friedman's son!) was too rough on Friedman. From their perspective, he's a statist and a socialist, but the fact remains that Mises, Rothbard, AND Friedman all advocate a world significantly freer than what we have currently. Considering that most academics still cling to some form of Marxism, I think Friedman can be forgiven for not seeing things through the praxeological lens.
And Friedman is a master at communicating his ideas clearly to the public without seeming like a nutjob. I'm not sure the Austrians have been as successful at that, and I speak as someone who has great respect for them. As a non-economist, I like hearing ideas from all the free market schools.
Now Thomas Friedman, there is an ignorant idiotic simpleton