One of my favorite games of all time and definitely my favorite RPG. The turn-based battle system is really well-done and allows for a good amount of strategy and decision making during encounters. The Sphere Grid is an interesting progression system that allows you to develop characters as you see fit while still giving them unique niches in the party. Blitzball is also a fantastic minigame.

I really love the story and characters as well. Some of the characters are a little divisive but I think they're all interesting and they all get time to shine and have decent arcs. I think Wakka in particular has a pretty interesting character arc. The world of Spira still looks really good to this day and it's a well fleshed-out setting with a distinctive look and feel.