The final fantasy series is great, don't get me wrong on that, but after FFX-2...well I don't really know what happens from there. I haven't played any of the FF games afterwards, and I heard FFXIII was a pretty big hit. I haven't experienced anything myself because unfortunately I don't have a PS3, but hearing that at least got my hopes up for the series a bit.
I don't know why, but the FF series nowadays just seems so different from how it was years ago. This is just my personal opinion, but the characters seem so...un-FF-ish. I'm used to the whole Cloud-Tifa-Sephiroth-Yuna-Lulu-Tidus etc sorta group, but I dunno, It could be that I'm just not used to the new characters yet or the game or anything of that sort. .__.
But I do recommend that you try most of them out and see how you like them.