Mis Qsenoch opens 5/2 ghost ship native village to my militia -BM strategy...
I buy provinces turns 8, 11, 12, 14, 15, 16, 19.
http://dominion.isotropic.org/gamelog/201208/13/game-20120813-155946-7896dc63.html
I don't think this is a good representation of this matchup.
Mic Qsenoch (whose confusing name I will just call MQ) unfortunately NV'd his Ghost ship on turn 3, so he didn't get to play it until turn 5. In addition, despite buying Silver in five of his first eight turns, he didn't hit $5 again until turn 9, while you hit $6 for Golds on turns 4, 6, and 7 and $8 for a Province on turn 8. When MQ finally did hit something useful again, it was $8 and you'd already bought a Province, so he followed you. To illustrate how bad his hands were, your Militia didn't affect the value of them at all until turn 10.
So yeah, I really don't know if Militia / BM is generally stronger than GS / BM, but I don't think you can read much into what happened here.