If you want your money's worth, play everything except for FFX-2.

And yes, it does matter what you are looking for in the game: A challenge? A great plot?

A great blunder that will provide you many hours of fun and hilarity and loss of calories, but because of the game's hair-brained and pathetic antics that desperately mimic Family Guy and disappointedly fail miserably?

Adverb usagely incorrected-ly-ish-ey otop isisishshshimunischiatioishinglyiendoandotuvieronishingly-donewellishley?

Beef steak? (No, just, no).

If you look for the first two, yet do not seek number three, don't play FFX-2. Don't worry about the Adverb part, all the FFs contain adverbs somewhere in them.

If you believe that number three is of greatest importance, then by all means, play FFX-2. You won't cut yourself in the thighs for playing it. I promise.

If you believe firmly in number four, then you really shouldn't be playing FF. You should be in an insane asylum. #4 shouldn't even make sense.

I'd probably start with IX, but VIII is worth a playthrough, too.