It is always nice when a film is having a little bit of fun with the whole superhero theme. Instead of the serious “with great power comes great responsibility” or “upholding justice and all that is good” blahs, we have a girl with great powers and a lot of issues. And she isn’t afraid to use her power to exact revenge against the man who dumped her.
The trailer explains the story straight out with a dark-haired Uma Thurman complete with glasses (she spots her original blonde hair colour when she dons her superhero costume, and yeah she loses those thick-rimmed spectacles) lashing out when her boyfriend dumps her.