OK, I am going to throw a ringer in the works here by disagreeing with everyone.
The enchanting thing with fantasy is that you are the creator of a world, and you are also the one who sets the rules for that world. Why can't you have a world, for example, where women wield power and men occupy a subsidiary role? Or perhaps a world of Skinchangers where both men and women can morph into the form of dangerous beasts, and are therefore essentially equal?
Even in Middle-earth there is room for variety. It is true that Tolkien utilized women sparingly in fighting roles. But I think it may be short sighted to divide the world into those who fight and those who stay home, with nothing in between. If Gandalf had been looking for someone with brute force who was a miraculous fighter, he would never have picked Bilbo. In such a scheme, Hobbits would be useless! But he thought more creatively, and came up with a character who would have certain physical and cultural limitations placed on him.
When you stop and think about it, this isn't too different from the type of limitations that would be placed on a "typical" woman. Morever, it's precisely because of those limitations that many of us can identify with Hobbits. If I think of myself trying to emulate Arwen or Aragorn in real life, I practically roll over laughing. A typical hero or heroine, I am not! But a Hobbit who lives in a Burrow, runs around cooking meals, and fussing at his children a la Samwise....that I can understand .
Even if you create a 'conventional" woman character, there are many roles that he or she could take on: roles that require dexterity or the ability to conceal oneself; a quick thinker who can get people out of a jam, a mother protecting her young children, a woman gifted in music or a craft, or, of course, the wise woman who has deep knowledge of lore. The list is endless.
I enjoy depicting both male and female characters. But, to be truthful, I think I have more insight as to how a woman thinks and acts. I do like to "break" other stereotypes in writing, such as women who are older and/or unmarried, or pehaps with physical limitations, or extraordinary gifts of one type or another but not necessarily the gift of hack and whack! So perhaps, there is more room for female diversity within Middle-earth than first comes to the eye.