I like all of them, except the first 3, and the online ones. So yay, post.
I liked the silent movie feel of 8, and 9, (7's FMV's were too crappy and just generally looks crappy even for its time imo, but is great nonetheless).
FFVII's world map was the best, because there were layers that could only be reached with certain vehicles/chocobos. And you had to do quests to get those chocobos, not to mention, you had to use a submarine as well. The world map in the other final fantasy's don't differ a whole lot for than the point and click found in X,X-2,XIII-2 and most JRPG's or even Bioware RPG's these days. I would have liked the series to have build off 7's where the overworld geography mattered,. but they quit building off of that at FF8, FF9 where it was a lot less interesting, and FFX where they removed it altogether.. (Though FF8 is my favorite).