I'll just name a few pros and cons that I can think of right now.
~PROS~
*Excellent graphics and sound.
*Sphere Grid; after a while you can make your characters the way YOU want them.
*Blitzball; though most say it's an extremely disapointing side-game, can you think of an FF with a mini-game that's just as playable?
*The voices; the animation was at some points pathetic, but the voices themselves were groovy.
*Break Damage Limit!
~CONS~
*Again, the voice animation.
*Too short, and a somewhat childish storyline.
*As Wondering Soul said, the 'going-through-game' aspect was kind of stupid, there was really no freedom, or different paths to take. For example go a different way for a possible storyline variation. Just go through one town, watch a story, battle a boss, solve a puzzle, do it all again, until you get the airship.
*Chocobos were somewhat ruined in this episode, I don't know why, but they just don't appeal to me any more like FFVII's did.
*The title screen! When I first loaded it, I thought it was a godamn demo..the way they promote their site and call it "The Final Fantasy X project".
*Some of the sigils/crests were just not worth it to get, for example Lulu and Wakka's.
*Far, far too easy. Don't mistake easy for time consuming, it takes a long time to capture all the monster arena monsters, but it's not difficult to do.
*The fact that it has far more cons than pros.