All i will say is that try the games out yourself & see if you love it start with earlier games in the series first work your way down from there to decide if you like the series or not if you love the classics I.E PS1 games,PS2 games.etc. & you might like the games if you like JRPGs & RPGs & so you know earlier games in the series is a turn based RPG & later ones becoming action RPGs if i compared them with each other.
& before you asked me no they'll not connected & only ones i think is connected are FFVII,FFVII Crisis Core this game takes place before events of FFVII,FFVII Dirage Of Cerburus & the anime of FFVII Advent Childeren & FFVII the last order if you wanted to know more & if you don't mind spoilers FFVII Crisis Core is a game where you play as Zack i believe it's also during the events of FFVII Crisis Core it's also his Death if you want to know ZAck died.
& it's where it begins yeah i know i got it off the case just saying all i will say is A try the games out yourself & decide if you like it or not or B watch some trailors,gameplays,longplays or lets' plays then decide if the game looks like it's any good & see if you like to try it or not & if you needed Cid's rocket password to get Bahamut Zero & the huge materia(if you already gotten bahamut & neo bahamut) then feel free to either ask me the password or look online for the password.
& So you know 1 of my favorite games FFVII is getting a remake for PS4 if you're interested so bottom line try at least one of the games in the series & see if you love it or not then there's your answer 🙂.