By no means did I dislike FF8. I really liked it, it's just one of my least favorite in the series. It's like having your least favorite Playmate of the Month.
I actually forgot about Terra being in Dissidia... but I was refering more to her being polygonal in FF6.
The disparity with FF6 compared to the ones that followed is that in the world of 3D graphics it's difficult to get emotionally attatched to chibi looking fat sprites for characters. The thing is, I played FF6 when it originally came out on the SNES, and at that time there was nothing like it for emotional attatchment and graphical beauty. It was the first time I actually cared about the characters in a videogame. And FF6 still has the best soundtrack of all the FF's.
As good as it gets
http://www.youtube.com/watch?v=bCYyGQD3j34