Why do you like Mary?

What better day to ask then this! I have never liked Mary Saotome. She is immature, annoying, and has little to no development. She is easily my least favorite character, even passing Kabura. Yet I see everyone so entranced by her. WHY?? Out of everyone! WHY DO YOU ALL LIKE MARY???

Update: Thank you for the insight! Mary remains my least favorite, but now I understand why others like her so much.