Women on Top in Glengarry Glen Ross

The women of Glengarry Glen Ross are conspicuosly inserted into the plot without any female characters actually stepping onto the stage. The action from beginning to end essentially revolves around them although it takes place in the "man's world" of hard-selling shucksters in a real estate office. Mamet relies heavily on popularly portrayed stereotypes of what men and women "are" or "should be" while also commenting on relationships. Whatever accusations of "Mamet as misogynist" that may exist, Glengarry Glen Ross is decidedly not (though some of the characters certainly are).
The action begins with Levene's sale kicked out because of a man's ex-wife. It is a strike to Levene and an allusion to an unhappy marriage ending in a (perhaps) messy divorce in court. The woman saves her ex from a bad investment and helps send Levene toward his downfall (score a couple for the women). This conversation also provides the first clue to a central theme of the play, beginning when Levene says, "I'm the man to sell." It's interesting that Mamet chose to stress the word "man" in this line and depending on how the line is given it could suggest theme to a more or less dramatic effect. Here also is revealed the second woman of the play with the mention of Levene's daughter who is apparently very sick and is his prime concern. Her illness ultimately ruins Levene as it is the motivation for his part in the burglary. Levene is a lot of things, but a thief, in the literal sense, is not one of them without this extra push of desparation.
The next scene really hits hard at women and is uber-derogatory with its obscene talk of broads and dead cats. Moss has extremely little regard for women, but while being a total misogynist he is not exactly set up as role model material either. Mamet created Moss as the worst of the worst: a racist, a bigot, a manipulator and a crook. He's disloyal, bad-tempered and greedy, and we are given no motivation for his crime other than avarice and a vengeful spirit; though it's suggested that he needs the money this hardly is a call for empathy.
And then there's macho Roma and poor, pathetic, emasculated Lingk. Lingk wields no manly power or authority. Roma uses this and is able to work Lingk masterfully, but in the end he cannot overcome the sway Lingk's wife possesses. In Roma's character we really see what this "man's world" is all about. For the most part it is control, not only of one's own destiny, but also control over other people. This "virtue" of control is in part proven by the ability to close the hard sell in business as well as relationships. This is the centerpiece of Roma's ruthless chastisement of Williamson to whom he says, "You stupid fucking cunt. You idiot. Who ever told you you could work with men? [...] I don't care [...] whose dick you're sucking on." He tells him further that he is here "to help men who are going out there to try to earn a living. You fairy. You company man. [...] You fucking child." This is a very specific attack on Williamson's manhood. Roma makes use of a gendered epithet and also one of sexual orientation. Williamson is a child doing what he is told and is a company man. None of this fits into the world of men that has one like Roma as its highest ideal. Roma is powerful, in control, successful, and cold. He is the perfect man in this sense; he is also thwarted by a woman. Lingk's wife saves Lingk, overcomes Roma, and it is her actions that lead directly to Levene uncovering himself (score the women a couple of more.)
Glengarry Glen Ross is a masterpiece and a brilliant exploration of gender roles. The characters exhibit some deplorable qualities but there is no attempt to make right or wrong by them. The audience can judge their character for themselves. If you find yourself liking these guys too much then maybe you have a twinkling of misogyny in you, but don't blame the author. I think partly what bothers some people about the play is that the characters and the lines are so memorable and alive. Audiences enjoy it too much and that makes some uncomfortable with it, and thus the accusations. There is also an uneasy sense of justice at the end which Mamet pulls off devastatingly: Moss gets what is coming to him, while Roma, the perfect man, does not (he loses the sale but is still pretty much on top of things). These two sort of balance out. But then there is a tricky sense of compassion for Levene, who undoubtedly has some moral misgivings but one still feels inclined to feel sorry for him and not necessarily want to see him go to prison (and where does that leave his daughter?). Ultimately, I think that Mamet is not making a statement of his beliefs on men and women but only a poignant observation of one facet of the real world. These characters exist. The plot is authentic and relevant to today.