Because she shows that no matter how attractive, well worded and scantily clad you make a female character. Her personality alone can make her completely and utterly unlikable. I spent an entire playthrough of that game TRYING to like her. I did everything for her. Took her to bed. Saved her life. Gave her gifts and treated her well. In the end. When it was time to save the world she refused to participate if she did not get something in return. I could honestly say that I would kick that woman out of bed. Purely based on her personality.