I can see how you could think so after playing XII. That one is one of my least favorites, mainly because the characters all got little to no development. But X? How?
People often complain about this, but to be entirely honest I really, really, really don't understand how. I love the stories of almost every Final Fantasy game I've played so far, and the characters in most of them are exceptionally complex and well-developed. The stories are complex and strong in the fantasy elements, but they do all make sense.
Honestly, it sounds to me like this is an issue with Japanese storytelling. They always tell convoluted and complex stories, with characters that are rooted in certain archetypes (but rise above them in the good cases, like Final Fantasy VI, VII, and X).
Based on your complains, I say try VI (which, due to some localization stupidity, was called III outside of Japan). It's incredible, and it was on the SNES before that spectacle you think is put over substance was possible.