I'm a bit of a FF fan. I've finished all the Final Fantasy's in the main series (US releases). I enjoyed pretty much them all, particularly VII, X and XII. I even played the two online games XI (several years before I quit) and XIV (which sucked hard).
I also liked XIII, but it didn't feel like a part of the FF series until post-game, at which point it opens right up with quests and challenges. Oddly enough, the post-game stuff easily takes longer than the game itself. I think I was around 120 hours in when I finally got my platinum trophy.
Anyway, I'm pretty stoked about XIII-2. So far the previews look great, I just hope they don't do anything goofy like they did with their other "sequel" X-2 (which was still fun, just weird).