21:Women too emotional to gamble

I don't normally get a chance to watch a lot of television or movies, but this week I got a chance to see the new movie 21. The movie is based on these college students who jet set to Las Vegas on weekends to gamble. As a whole the movie ended up being better than I thought it was going to be. After dwelling on the roles of the characters I was slightly disturbed.
The women in the movie although they were main characters didn't really have a major role in the film. They didn't make any big decisions they were only accessories or pawns in the scheme. The Professor Rosa (Micky) made a comment to the main character, Ben while he was approaching him to be the "Big Winner" that he couldn't trust the girls. And stated that he need the "Big Winner" to gamble without emotions and stick to the system. In some way I felt he was saying that the women couldn't handle leaving their emotions out of the game.
The female main characters, Jill and Kianna, are students at MIT but they kind of downplayed their intelligence. The most memorable scene that I can recall that featured both of the girls was during a shopping spree. The college students often wore disguises to hide their identity from the casino workers and the portrayal of the women were always the same. Jill, a Caucasian female, was given a flirty, sensual name and her role would portray her as ditsy or extremely sexual. Kianna, an Asian female, seemed to never know English as her role and she was dressed in revealing clothes as well. The only other women that I can really recall from the movie other than Ben's mother were the strippers.