Pride & Prejudice is a beloved book because it has a smart and sassy heroine who through various trials comes to realize she is flawed. She is lucky because the most eligible man around (who happens to be in love with her) is also flawed, and also comes to realize this. In many ways, and despite his great wealth, they are equals, and they evolve in a similar path. Also, through the narrator, society and marriage are stingingly satirized.
In this film, Darcy is a little prissy, but that's about it (there is no real class issue with him). It's Elizabeth who is haughty and at times cruel. She must deal with public humiliation at the hands of Collins, eat her words after her outburst to Darcy, and realize she is a really bad writer. No one else in the story changes. In this modern setting, none of the girls have any career aspirations (except for Elizabeth whose dream as a nine year old, we are told, was to be a writer), pms is blamed for an eating binge / self-pity wallow, and the end-of-the-story, where-are-they-now montage includes plenty of mentions of children.
In the features section the director says this movie is meant to be a fable.
It seems to me, the filmmakers' (misogynistic) moral is: woman, you may think you are happy being independent, but you are really being proud and silly, and you won't be happy until you have found a home and a husband. WWJD, what would Jane think?