I thought that most of the game was stupid. Final Fantasy before it had a consistant enjoyable plot, whereas FFX-2 gave you a very brief part of the main plot every chapter. The whole thing would take 5 minutes to tell. Also
(SPOILER)Shuyin being the last boss was too close to Tidus being the last boss for my comfort. Made Yevon look like a promising train of thought.
I've always seen sidequests and mini-games as something to trail away from the main game. I've never thought it worthy to make a came that's made entirely of sidequests and mini-games.
That said, what little plot it did have was alright. I liked the Crimson Sphere cave scenes.