Tidus had plenty of moments where he did or said something cool, but most of the time I found him whiny and annoying. He also showcases the very worst of James Arnold Taylor's voice acting, even more apparent if you happened to see TMNT and heard Leonardo's voice, his scream even more so.
I also hate the constant bickering surrounding the pronunciation of his name.
What I liked about Tidus: He was a Time Mage who could kick ass, and you could rename him to something more befitting his personality, like F***hole.