I'll readily agree that there are authors putting out excellent work who don't get nearly the recognition they deserve, but the only examples who come to mind are authors who are extremely not-prolific (I'm looking at you, Ted Chiang. And, to a lesser extent, Barry Hughart for Bridge of Birds). They produced a book or two and dropped off the map, and even so they get mentioned around here with some regularity. I can't think of anyone regularly putting out quality work who gets ignored.
As for the male author/female author split... eh. I'll lay my biases out on the table: I'm a female reader, I like primarily giant sweeping epics with well-realized characters and lots of action, and there is not a single female traditional fantasy author that I really, really love. There's a handful that I like (Melanie Rawn, f'rex, gets maligned a lot in these parts but I still like her work, goshdarnit), a couple I can't stand, and a whole lot more who sink into an undifferentiated mass of melodramatic cuddly-wangst poorly-written crap.
The top and the bottom of the genre are both occupied by male authors, in my mind. I haven't found any female equivalents to GRRM or Guy Gavriel Kay. On the other hand, there aren't any female equivalents to Robert Newcomb, Ed Greenwood or David Bilsborough either, so hey.
They also don't write huge complicated sagas with massive casts of characters and lots of narrative mysteries (WoT, ASOIAF, Malazan), where people can speculate and argue about what's happening to whom and why and who's behind it. So, based on that opinion, it doesn't surprise me that these books don't get as much discussion; they don't inspire the same peaks of love or loathing as the guys', and they tend not to have as many plot twists/holes to talk about.