A research study about movie reviewers by the Alliance for Women Film Journalists concluded this way:
"In short, men dominate the reviewing process of films primarily made by men featuring mostly males intended for a largely male audience. The under-employment of women film reviewers, actors, and filmmakers perpetuates the nearly seamless dialogue among men in U.S. cinema."

You can read the whole study online here
http://awfj.org/hot-topic/thumbs-down-representation-of-women-film-critics-in-the-top-100-us-newspapers-a-study-by-dr-martha-lauzen/