I think in recent years the quality of the main Final Fantasy titles is not as good as it was in the past, although still much higher than almost all rpg's out there.

Final Fantasy XII needed a better story.
Final Fantasy X-2 people didn't like the story and characters as much.
Final Fantasy XI people were not sure about this for various reasons, although a great title.

I don't remember if a signifigant number of people had problems with Final Fantasy X, do you remember?