Most weren't too tough, yeah. I just am not convinced there's any reason things work. It's possible that the more difficult puzzles just eluded my understanding.
I like how in more dedicated puzzle games like Portal, I'll have a good understanding of my abilities and just have to figure things out until I get that "Aha!" moment and it all falls into place. I don't think FFX works that way, mostly I just throw spheres into walls and doors and stuff happens and I get through it. I don't walk away feeling any smarter.