Well you all know my opinon on FF RPGs having voices.

But I'd say the worst had to be Yuna - I like the character, but she had this weird "Americanese" acent going, which was kind of a bad choice on the actress' part, there's one scene where Yuna is blaming herself for something (a while since I played it) and she's all like; "Ahm Sohry! Ahm Soh Sohry!" - a bit too stereotypical...

Oh, and the Tidus laugh scene is supposed to be sarcastic. However, that doesn't stop it being torture for your eardrums.