The gambit system is cool on paper and I really like being able to customize the AI of my companions, but I could basically get through the whole game by just setting everyone up to auto attack and use potions when under 50% HP. Maybe if I did some more of the hunts and the optional stuff I would have had to get more creative, but most of the main game never really made me change my strategy. Outside of the gameplay, though, it's pretty good. Ivalice is a great setting, the focus on human politics and conflict over a classic good vs. evil story for most of the game is refreshing, and the actual dungeons are these sprawling labyrinths that are a lot of fun to navigate. It also probably has my favorite soundtrack in a mainline FF title, so there's that going for it too. The zodiac job system was kind of cool and making custom classes by mixing two jobs together was neat, but that's another thing I never really needed to think about outside of "hey maybe this character could use some magic" or stuff like that.