I liked 6 during the linear portion but I felt like during the open world portion I was wandering aimlessly. I do agree that some of the characters are under developed. I also recall watching the credits, and the characters doing a bunch of stuff you never actually did in game and thinking that the game would have been better if you had.

Idk it just seemed to lose all it's steam halfway for me. I didn't dislike the game but I do think it's highly overrated. Ff4 and 5 I liked better, especially 5.

I didn't play it back in the day though, played it for the first time on the snes classic