Final Fantasy X is when the series went from this hallowed series to just another one. That fall marks it for me as the worst. I think I completely reset my expectations and was easier on XII and XIII because of how awful I found X to be.

I couldn't bring myself to finish FF XIII-2 but I didn't really dislike what I played. I gotta go with Final Fantasy VIII. I was so stunned by the intro and the promise of a love story. Didn't really enjoy the game or the story at all. I think I got to the part where everybody suddenly remembered that they used to know each other. I was young and didn't really have high expectations for video game writing but I think my reaction was "REALLY? You gotta be kidding me!". The gameplay wasn't very fun to me, either. I liked the card game, though. I was obsessed with it until the rules went all crazy.

I'm not going to pretend I played them all.  I first played VII, then went back to VI (aka III), VIII, IX, X, X-2, XII, XIII, and XIII-2 and I played on on DS that I couldn't finish.  I played a few spinoffs too like Ehrgeiz, Crisis Core, and Tactics.

Of those three options, probably the DS version. FF6 might be a better choice if you want to see what the fuss is about, but FF4 gets a better mix of old and new parts of the series. Plus, it's the easiest FF game to play, in terms of pacing and the like.

FF XIII, no doubt. The game was completely boring and mindless.

13! Lost Odyssey was more FF than this garbage.

P played 7, 8, 10, 12 and 13... I only really liked 7. I keep playing them trying to find one that can match 7 for me but it never happens. I enjoyed 8 but after boarding the ship from that one city I could never get past the dude who odin comes during the battle. I never got my hands on 9 because a friend was suppose to let me play it after he was done. 10 was beautiful and a solid game but was short and final boss was waaayyyyy too easy (could you even die?). 12 and 13... need I say more? (I liked 12 better though I can not remember anything that happened it it so maybe not)

        You should try FF9. It's totally worth it in my opinion.

unfortunatly I dont have the hours to invest in 1 game anymore. But I have always been interested in giving it a shot sometime.

      You should give it a try when you will have the time.

XIII was easily the worst. It's just missing so many elements that I consider essential for an RPG and shamelessly relegated the lore and storytelling into a horrible wikipedia sized data-log.