Aww, man... I joined this site just to comment on this...
Anyway, before I give my opinion, I want you to know some things. First of all, I own and have beaten almost every game made by square. I enjoy them all, simply for the diversity and story each game has to offer. One thing that is consistant in most games in the Final Fantasy (or in square games in general) is the storyline. They all made me sad, and a few made me cry.
First off, the ones I didn't like. Of course, I'd rather play the games I didn't like over most games anyday.
(I'm kind both ways on this one, so be nice...) Final Fantasy 8 - The story was great. Theres only one problem with this game... and thats the GF's. The system made you put waaaay too much faith into them, and most of the hard bosses were beat in a few shots by them. Too bad some of the bosses are impossible to kill with GF's alone, and that f'ed me over so much I actually had to restart the game. Fantastic.
Final Fantasy 9 - The story was decent, and so were the graphics. But it wasn't that fun to play, and half the time I spent figuring out what to do. Mostly because I refuse (in general anyway) to look at a walkthrough for a Final Fantasy game until I'm sure I've exorcized every way.
Final Fantasy X-2 - Oh my god. I don't know where to start with this one. It is annoying (Gullwings go!), too whore-ish, and too gay (well, it made me feel gay playing it...) for me to play. But the battle system and the fact that you could get different classes was great. The story was probably the worst out of every Square game (i.e. OH EM GEE I THINK ITS TIDUS!!). Even then, the story was amazing compared to other games, and the diversity this game had to offer was great. Though 3 playable main characters isn't exactly my idea of fun either. I beat it though, just because I wanted to see the ending. What a disgrace there. "Higher!!"
(This isn't on the list, but whatever, I have to rant!) Final Fantasy XI- What a sad exuse for the Final Fantasy name. It's one of the worst MMO's I've ever played. I love the PlayOnline thing tho, and I think it's the only reason I've payed for 2 months (plus the free month, so I've played this game 3 months...)
Oh, and just so everybody knows, I hate the direction Final Fantasy is going. Stop pushing realtime battles!! I hate them!! Do something like Grandia II if you must, but I love turn-based!
P.S. I have played the original Final Fantasy games in Japanese (actually, I'll probably end up buying a Famicom and importing them eventually...) and I don't like 1 and 2. I just don't. They don't have the epic story there, even if they are fun.
Final Fantasy has given me high requirements to what I expect in a game, and very few non-square games satisfy them very well anymore.
Anyway, that's my rant.