I don't get what's so bad? No one has ever seen the princess, since she's been in exile since she was a small child. Even a child who had blonde hair when they were born, could have brown hair by the time they're a teenager. It makes no sense why the fact that they chose a random girl with the same features bugs so many people? It's written fairly decent, and is pretty easy to understand. I'd say so far, it's better than a lot of stories in this same genre.