[foxbat]

If you have girls that cant really pitch, just teach them to throw strikes.

If they cant pitch, they cant throw strikes.
Take a look around, Ill bet that you will find the best teams have the best pitching staff. It takes much less time and energy to develop a hitter than a pitcher, not saying that is easy, but it is easier than developing a quality pitching staff.
If you have a team of sluggers with poor pitching facing a team of average batters with excellent pitching, all other things being equal, I believe the team with the better pitchers gets the nod.

All that said, it is best to have a well rounded team if possible.