Wakka is awesome what is wrong with you? Lulu has about as much personality as a bucket of paint.
I'll admit that I consider FFX as one of the better games (Ival has it right with IX being the best, of course) because the world in which FFX takes place is fully developed and characterized. In some of the best FF games to date - take 6 as an example - the world was pretty much just a big mass of land. It served to do nothing more than pose as a stage for other events to unfold. You have the war of the magi, and you have people living in towns scattered around the world map, very few of which have any sort of detail to them (ZOZO being the only one I can really think of) and that's about it. The world in FFX had cultures, religions, racism, history, pastimes - there was just so much more to it. Tidus was obnoxious and Yuna was bland as hell but the world itself felt believable and immersing.
Though I don't know why FFX is getting the remake treatment. It's really unnecessary. The step from PS2-era gaming to half-ass current era gaming doesn't offer a whole lot. Even if they whole-ass it, and bring the visuals to FF-XIII's level (rather than the GoW remakes, the Beyond Good and Evil remake, or the Ico/SotC remakes, which actually look terrible by this era's standards) it's still not going to add anything to the experience. At least, with older titles (anything before FF X, actually), the worlds and characters can be expanded on. PSX-era technology couldn't afford to do things like facial expressions (except for Conker's BFD, of course) and the locales were far more restricted and scaled back to fit the medium. By the PS2 we'd basically hit our stride, so we don't stand to gain anything by remaking FFX, except un-nightmare'ing the laugh scene. Oh, and making the lightning and water effects prettier.