>>715173735 (OP)1 is a classic if fundamentally very simple RPG not unlike the original Draton Quest
2 is an experimental game that you could see as the genesis of Saga games. It's interesting if not that good
3 is super forgettable. It's sole contribution is being the proto-jobs game
4 is the original movie game. But, it's a really good movie game
5 has the best gameplay in the series (the completed Jobs system). The story isn't great but it's fun and doesn't get in the way of the gameplay
6 trades some of the freedom in gameplay for a better story. You could see it as the predecessor to modern FF.
7 is the definitive game which really raises the presentation production value through the roof and all FF take after it. It's mechanically solid, like 6.
8 is once again a super experimental title. The game is basically a mess but an interesting mess and it has a really strong beginning and ending.
9 is like trying to do a classic early era FF story with 7's style. It's quite good but it suffers from being fucking slow.
10 changes the battle system to a stack based system from ATB which is probably the second best battle system after 5. The game suffers from being super linear to make up for increasing production values but it's still a good game.
12 is a love it or hate it game, it's really unfinished but tries to modernize exploration of the world in a pretty intuitive way. Combat is pretty mediocre though with the offline MMO system and crappy version of jobs.
13 is garbage but it looks pretty and isn't completely braindead in terms of combat
15 is garbage AND is completely braindead in terms of combat
16 isn't a JRPG. Other than that it's actually a pretty solid classic Final Fantasy plot but it's not an RPG so is it worth even bothering?
I don't play MMOs so no comment on 11 and 14.