I don't hate it like others. Yes it had problems (the extreme linearity of much of the length), but to its credit, it feels like Final Fantasy, which I can't say for 12 or 15. Neither the tone or gameplay of 12 are Final Fantasy to me, and 15 is a complete abomination of a product, so 13 in hindsight looks pretty good to me now. Don't get me started on the supposed sequels though (they are bad fanfic that try to retcon 13, a full and complete story, to justify their existence and don't exist to me).