Microsoft flagged nearly 500,000 genuine users as Pirates, its not a joke its damn true. Accusing half a million legitimate Windows users is a serious matter. Being accused of being a pirate is no laughing matter. How much time has been wasted on false positives? How many people who had genuine Windows licenses have given Microsoft more money when they didn't need to. Users need to be able to trust Microsoft with the power that WGA gives the company, and at present it's clear that there is huge distrust.
One way Microsoft can start to build trust is to be clear about how many genuine Windows systems have been wrongly flagged as non-genuine, and be open and clear about what they are doing to reduce the impact that WGA has on genuine Windows users. Until then, people who know what WGA is will be wary of this technology.

The WGA has really proven to be a disaster to genuine customers as well.