To me, Squenix games are hit-or-miss. Either they are made of win, or made of fail.
I personally liked FF7 a lot at the time I first played it. The storyline was better than a lot of things I had seen up until then (which was, admittedly, limited), the gameplay was unique, the battle system involved without being too complicated (I liked the way Tifa's Limit Break reels livened up the game, for instance). The graphics were pretty good for the era, the FMV was very new to me, and the characters themselves tended to be pretty interesting to the high school sophomore that I was.
It's not the Greatest Hit Ever, and better games have been made and released in the US since then, but it still has a good value in my heart. I still play it now and again, for nostalgic reasons.
Final Fantasy 8 was just too "meh". Squall just completely failed to be someone I can identify with. The only fun thing was the way some of the limit breaks increased the interactivity, and even then, it tended to get in the way more often than not.
Oh, and let's not forget how the game punishes you for leveling up. "Oh, gee, my party's at level 100, so they should have an easier time against the last boss... L5 Death?! Oh, FUCK YOU!"
FF10 was decent. Tidus was too whiny for me to like him much, but the other characters were fun (well, Rikku did get on my nerves on occasion, but Auron made up for her). FF10-2 just ruined it for me. Yes, I do want to see more resolution to 10's plot, but not if I have to sit through a shitty magical girl-slash-Charlie's Angels wannabe grrl-power wankfest to do it.
Haven't played 12.
I honestly thought Final Fantasy IV was the best of them. The characters were good, the story was engaging, the gameplay was fun, and there were enough sidequests to keep me from getting bored with leveling. Plus, it had one thing that no other Squenix game I can think of right now has: A final boss who is still a big challenge, even if you max your levels, get all the spells, and find all the best equipment. Zeromus was, and is, a massive bitch to beat.
Call me old-fashioned, but I kinda miss the good old days when the Final Boss was the biggest obstacle your party could face. It makes finishing the game just that much more fulfilling if you don't have to look outside the climax of the story for the Ultimate Challenge.
Plus, it was the first CRPG that I remember playing (Zelda doesn't really count, to me), so that gives it nostalgic value.
Outside the Final Fantasies (whose name grows increasingly contradictory with every successive title :snigger: ), I still enjoy Seiken Densetsu 3 a lot... but I was severely disappointed in Sword of Mana, the GBA remake of Seiken Densetsu 1 (which had, for some unfathomable reason, been released in the US as Final Fantasy Adventure).