Drone Casualties Less Than Believed?

An interesting report by the Associated Press claiming that the number of civilians killed by U.S. drone strikes in Pakistan is much lower than claimed by Pakistani opponents of the campaign, as well as other media reporting, a subject I've discussed previously.
Although the AP's methodology is still somewhat inexact, they come up with the same figure for total casualties as reported by Pakistani intelligence.  Yet the AP reporters find that, excluding one attack that allegedly killed 38 civilians on March 17, 2011, Pakistani villagers interviewed say 90 percent of the victims of all other people killed were militants.  Conversely, the London-based "Bureau of Investigative Journalism" has claimed the percentage of militants killed is roughly 70 to 80 percent.