I don't think he is. Elements of his government are, but he is doing about as much as he can for us without being overthrown. And there is an area along the Pakistan-Afghanistan border that is very hard to control.
It would be easier to control it with more troops in there. Right after our victory in Afghanistan, Musharraf had a lot of troops in there and they were actively helping in the effort. Then India moved a lot of troops to the Kashmir border. This had the desired effect of forcing Musharraf to divert some fo the troops from the Pakistan-Afghanistan border region to Kashmir. That also may have allowed bin Laden to slip through when he couldn't have before (an outcome which would not disturb the Hindu Nazis.)Then India complained publicly that Musharraf wasn't really helping the anti-terror effort. What hypocrites!