I had to post twice since vgchartz wouldn't let me start a new line in my previous post
As I say all the time, you can rank games based on how good they were at the time of release or how good they are compared to games today. Doing both doesn't make sense. I will rate games on how good they were when they were released.
1) FF: I don't think this game gets the credit it deserves. I know it is not the first RPG (Dragon Warrior gets that award), but it is one of the first RPGs and had a distinctly different feel than Dragon Warrior. Both games were pioneers for their time; No other games were doing what they were. For being the first games to do it, they did a damn good job.
2) FFVI: Most anyone who played this game when it was released thought it was amazing. Big advancement in battle system, character building, and graphics. The story and environment was amazing and original. It took the FF universe into a new direction than the traditional medieval setting RPG.
3) FFIX: This is where the decision become tough. FFIX brought together the legacy of FF games to bring an experience that seems classic, but with an advanced character building/battle system. To those gamers who started playing FF games at FFVII, I can see why they would not like this game because it was not made to appeal to them.
4) FFIV: Huge advancement over FF (NES), which was the only other game most of us had played before it since FFII and FFIII was never released in US until they were remade. Even if you factor in FFIII, FFIV was a huge jump in the same way FFVI was over FFIV. It was the last of the 'classic' style FF games until FFIX (excluding FFV).
5) FFVII: This is the last FF game I played at any length. By no means is it a bad game, but not a huge leap in gameplay like FFIV and FFVI was. This may be attributed to the cost of developing 3D graphics at the time. Plus, the bad 3D models detracted from the experience for me. Also, the story seemed to be quite a cop-out for the series to appeal to a larger audience. Just look at the characters: Big black guy with gun, hot karate chick, generic anime sword wielding character. I put out all these negatives to show why the game isn't higher amongst the elite, therefore it is still a great game.
6) FFVIII: I liked the story in this game...nothing else. Interesting gameplay concept, just didn't come together very well.
Honorable mention to Final Fantasy Adventure. #1 handheld FF game. Didn't like Final Fantasy Legend games very well.
FFXII sucked. Not for the reason most people mentioned (MMORPG style). That was the reason I thought I would like the game because it reminded my of Baldur's Gate games. I still point to Baldur's gate as the #1 best RPG gameplay system (of course, they stole the gameplay from D&D). One of the most important aspects of Baldur's gameplay is damage prevention over healing. I can't emphasize that enough. In FFVI, you would heal every few seconds later in the game, and at that time it was OK. Nobody knew better. Nowadays, I expect something more interesting. FFXII was what I call a heal-fest. Too much healing...damage prevention methods were not seen as important. Makes a simplistic gameplay experience.