And here is one of the biggest problems with the Mary Sue criticism. It’s too subjective. Your Mary Sue is my awesome hero. My Mary Sue is your sympathetic heroine. Your Mary Sue is my empowered female character. And it’s that last point that is particularly important because Mary Sue is a gendered insult. Most characters accused of being Mary Sues are female. The term for it is a woman’s name. Some people even claim that men cannot be Mary Sues (or Marty Stus or whatever) at all. Think about that. Female characters are annoying for being ‘too awesome’, but it’s just impossible for a man to be too awesome.
At this point the author dropped her mic and walked away.