I've had women in my games for most of my gaming history, but most of them don't have much desire to run a game. Currently, of the four women I game with, one doesn't have time to run a game, another doesn't have the confidence in her gaming skills, another doesn't have the interest, and the last doesn't think she's a very good GM. I'm sure she'd do a good job, and is the assistant GM for her husband. She does most of the bookkeeping for the entire group, making character sheets and doing all the treasure distribution.
The one woman I've played under ran a very hack-n-slash, old-school kind of game. It wasn't really my cup of tea, honestly, but that didn't have a thing to do with her gender - it was her gaming style. I ran a game with her in it for a while, but we didn't mesh too well that way, either.