I'm gonna add more than just what I liked!
I hated 8. Okay, I hate Squall (though I like him in Kingdom Hearts...go figure). Though I did like Laguna and the others quite a bit. Selphie was annoying as hell...and Zell? He was in this game right? I both hate and like him. I was more of a like the flashback play person.
Loved 9 <3. I love Kuja. He's my favorite...though Sazh does come close with his baby chocobo in 13. But Kuja has a good back story of course I might be confusing canon with fanfiction now. But he was created to destroy the world but he's flawed, a first creation, and so, his "father" Garland makes another to take his place. And through how Garland treated him, he was insane. Very much so. I pitied and sympathized with him.
I also liked 10 because of the story. Like I never finished it, but I was talking to someone, and I essentially guessed how Sin came about. They go on the pilgrimage to stop Sin, but all they're doing is making the cycle continue, but they can't know that because no one has really tried to break the cycle.
I liked Crisis Core too...it made me cry
SO FRIGGIN SAD! D: But yeah, kind of made me like Cloud less (which by default made me dislike Lightning from 13 more-make a female Cloud...that's what they were told to do -.-)
Yeah, gonna stop ranting now XD