Having just finished Final Fantasy X, I have come to feel that X-2 should not exist. The ending, in my opinion, was so perfectly executed there really was no need for a sequel. You see Tidus vanish after Yuna admits her love for him, then at the end you see him swiming upwards, happily and eagerly.
I see this as the best way to end the series. It hints that Tidus made it back to Yuna, but leaves it completely open to your imagination. I don't think we need a game that involves three scantily clad young women changing clothes in the middle of the battle to resolve this already great ending.
Any thoughts?