They could've done so much more with that part of the story. Zanarkand itself was such a mystery to me, and I wanted to explore more of it. After Tidus (SPOILER)gets sucked up by Sin, it seems like its only use at seeing it at all was to let us know that Tidus wasn't lying about being there. I wanted to know more about the battle between Bevelle and Zanarkand too. They could've shone some serious light on Yu Yevon though. I never saw Jecht as a villain. I always felt sorry for him.