Anastasia Steele is a much talked about character. She is the lead female protagonist of the popular 50 Shades of Grey, and people absolutely love calling her a Mary Sue.
You might not like her, or understand what Christian Grey sees in her, or feels that something in 50 Shades of Grey wasn’t really what you wanted it to be. You might find it hard to empathize or sympathize with her, or that her story is hard to believe. But none of that makes Anastasia Steele a Mary Sue.