Thanks to Ode: The online community for intelligent optimists:
I just found out about the Bechdel Test for women in movies.
From the web site: The Bechdel Test, sometimes called the Mo Movie Measure or Bechdel Rule is a simple test which names the following three criteria: (1) it has to have at least two women in it, who (2) who talk to each other, about (3) something besides a man. The test was popularized by Alison Bechdel‘s comic Dykes to Watch Out For, in a 1985 strip called The Rule.
Regarding some movies I’ve liked: Despicable Me and Stranger than Fiction pass the test; Ratatouille and The Pursuit of Happyness do not!
Check out the Bechdel Test Movie List and see if your favorite movie passes the test!
Tidings of Comfort & Joy 
Hmm. That test is an eye-opener. I cried and cried at Pursuit of Happyness–but of course other than the main two characters…or maybe just the one, there weren't what I'd call round characters.