My rankings list changes day to day. In fact, it will likely change a bit as I go back through and play these games again for the podcast. Here is my list of the main series games as I would do it today:
1. VI
I'm not sure that I have the words to properly describe all the ways that this game is great. The score is beautiful. I absolutely love Terra's theme. I love the Opera scene and music that accompanies it. For me, the score to this game might be Nobuo Uematsu's masterpiece. While this game was developed for the 16-bit SNES, I still feel like Square really pushes the SNES hardware to its limits with the graphics. The way they could get the sprites to show emotions. Those subtle movements were things I had not seen in a game before. The story is beautifully told. There is no real main character in the story but most of the main characters get their own well-developed back stories and motivations. I love the esper/magic learning system. Kefka is one of the most unforgettable villains of all time. There is a certain magic that goes along with this game that I cannot explain. It's perfect.
2. VII
I know some of you are looking at this and thinking "Blasphemy"!. As I stated above, my list tends to change from day to day. Sometimes VII is number 1. Sometimes it is number 2. I have played FF VII more times than any other game in the series. I will never forget the advertising campaign that Square ran for this game in 1997. Those commercials are burned into my memory. I could fawn over this game all day long. The materia system is perfection. Nobuo Uematsu's score is beautiful and, at times, haunting. The characters are extremely memorable (with very few exceptions). The story is well told but complicated. Who could forget the first time they watched a FMV from this game? Or the first time they witnessed a summon? This game is a masterpiece.
3. IV
Words cannot describe the feelings I experienced the first time I played this game. The opening sequence with the terrific score playing over the top of it. Cecil was the most complicated and, therefore, most real character I had ever played as in a game up to that point in time. I still hold a soft place in my heart for characters like Kain, Rosa, and Rydia. The story was memorable and terrific. The score was top notch. This game is damn near perfection.
4. IX
In my opinion, this is the last truly great Final Fantasy. Memorable characters. Terrific score. Beautiful art direction. Pretty good (albeit at times convoluted) story. I love the ability system in this game. It's quite reminiscent of Final Fantasy VI's system of learning spells from Espers. This is a love letter to all things that made the Final Fantasy series great.
5. V
For me, this is where Square perfected the job system. It is for this very simple reason that I enjoy Final Fantasy V so much. The story is weak and, for the most part, the characters are pretty uninteresting. The job system, however, made this game so much fun. Every time I play this game I have every character max out every job. Is it too much level grinding? Not at all.
6. X
Sometimes this game gets ranked lower on my list. I know that the overall community loves FF X but there are some things about this game that really annoy me. I dislike the orb leveling system so much. I like leveling systems to be simple. What the hell is so wrong with the way your characters leveled up in Final Fantasy I - VII and IX? *sigh* There are things that I very much enjoy about the game. I think the story is very good. The score is a big highlight. The game has memorable characters. I can see why so many like it as well as they do. My grievances with the game keep me from ranking it higher though.
7. XII
I think FF XII gets bashed unfairly sometimes. When I first played this game, I was so impressed with the look and feel of the game. I enjoyed the gambit system (to a degree) and the battle system. I liked the fact that there were not random encounters, instead, you just came up on the creatures and basically picked a fight. The license board, for me, was a pain in the ass. I felt like making gil was overly difficult too. The worst part of the game, and this is the reason why it isn't ranked higher on my list, is the damn limit break system. It is such a pain in the ass and is so random. It makes some of the boss fights and hunts/marks so painful and overly difficult.
8. XIII
This game seems like it is pretty polarizing as far as the Final Fantasy fan base is concerned. Some liked it, some didn't. There are elements of this game that, for me, were a great deal of fun. I loved the battle system. I liked the score (especially the battle themes). I disliked the confusing story, the majority of the characters, and the overall linearity of the game.
9. VIII
Some would consider this game to be among the best in the series. I respectfully disagree. It definitely has its high points graphically and in its art direction. However, I feel like the story is confusing and overly convoluted. The draw system sucks. The junction system sucks and is easily exploited. I hate the level up system and, as a result, the fact that the monsters level with you. The score, in my opinion, is pretty forgettable except for the song that plays during the opening FMV.
10. III
This early foray into doing the job system was fun but, at times, difficult. The story is weak and I don't really find myself caring of the characters.
11. I
Despite its ranking on my list, I actually very much enjoy the original Final Fantasy. The weakness of the story is really what keeps me from ranking it much higher.
12. II
I hate the level up system in this game so much. Yes, it is easily exploitable but it is a complete pain in the ass. I really hate that Ultima does damage depending upon not only its level but also the levels of the rest of the magic you have. Grrrr.
13. XI
No Final Fantasy MMO should ever have been part of the main series. In the limited time I have spent with Final Fantasy XI, I have found myself disgusted more often than not. I think the game, graphically, is dull and boring. I find the combat to be tedious and boring. I find the score to be probably the weakest of all of Uematsu's scores. I think, most of all, I disliked the fact that this is a damn MMO. I have found a lot of the more experienced players to be very disagreeable and cold to new players. It's not a very welcoming environment. To me, the Final Fantasy series should always be the single player story-driven experiences that the previous 10 games in the series were. This should have been called Final Fantasy Online.