When did you play FFX?
I ask cause at the time it came out, I thought the voice acting was fantastic... mostly because there WAS voice acting.
Years later, playing it again, I realized its not quite as good as I remembered, but I still love it anyway. The gameplay was insanely satisfying and enjoyable, with an innovative leveling system; all wrapped up in a really nice story.
That said, not ALL the voice acting was bad. In fact, I'd wager to say none of it is THAT bad. Frankly, I don't even quite get the level of hate Tidus's voice actor's gotten. It may not be a stellar performance, but I felt he sufficiently carried the role. Yuna's voice actress fit the character, and her sort of... meek personality, accepting of her duty. I felt she sounded a lot stronger once the character started to become stronger.
Jecht was an awesome character with some pretty solid voice acting, I thought. Auron... Auron was probably the single coolest character in the entire game, maybe the entire franchise and DAMN his voice actor did a great job at giving him an awesome voice to match.
And Rikku was voiced by Tara Strong. There's a reason that woman has gotten about a bajillion voice acting gigs to date; she is damn good at her job xD
X-2 was pretty bleh, though, I agree. Got a few hours into it and just couldn't play it anymore. The gameplay was fine, but the atmosphere, tone, characters, everything just felt... cheap, compared to the epic, dramatic nature of the original. The story itself isn't bad, I just feel like they could have executed in a less... silly way.
Edit: Also, I don't get why people complain about the laughter scene; I know you didn't mention it, but a lot of people do. Even people who loved the game. Yes it was awkward, but it was my impression that the scene was SUPPOSED to be awkward. They were forcing themselves to loudly laugh in public. That would be awkward. Try doing it xD