Played 6,7,8,9,10, and 13. Granted I never finished 13, 10, 9, or 8. But I did watch my brothers play the others through the completion so I DO UNDERSTAND THEIR STORIES. Felt like they all had interesting things to offer. No, I don't think 13 is either a bad or a good game. It has its story problems. Most, almost all Final Fantasy characters have depth and are dynamic. Most of them change throughout the story. The writing/dialogue isn't necessarily fantastic but what they are able to do is get you to feel invested in what happens to these people. I think they're all great stories in their own right. Almost all plots in final fantasy get crazy convoluted, but so do most other stories in other media. The plots aren't what I'd call 'thin', they're at the core simple ideas but expanded upon by character interactions and motivations.