i think there are goods and bads in each one that people like and dont like. here are mine:
FFVII: awesome, just dont like the gold saucer part and chocobo minigame. i find the overall theme of the game a bit depressing :/ and i cant beat the 2 weapons :/:/
FFVIII: awesome too but not quite understand story much, drawing magic suck, and switching back from laguna team makes you rejunction all the crap sucks. summoning is cool.
FFIX: i really like the art style. the only one that i did everything i think, like the chocobo hot and cold, killing ozma, all final weapons. summoning is useless.
FFX: dont like the linear route, and sphere grid. dont like summon system.
FFX-2: cheerful and fun to play lol. leveling a few different jobs is fun. like the 2 songs also
FFXII: crappy story and liscence grid, X's summon system suck. i wish you can equip 2 accessories :/ i like the battle system and world design.
FFXI: still playing the MMO, my taru is too cute to give up
FFVII dirge of cerberus: errr....crap.
havent played anything before VII, dont want to see those 2D graphics anymore.