I was never able to take Kefka seriously. He was always a comic clown. He had his moments when he killed Leo and destroyed most of the world, but after that, he's out of the storyline for so long that when I faced him again, he was still a clown for me. His "self-help booklet" comment and other things like that, such as him jumping in rage and having tantrums, were merely amusing, and him going down in less than 2 turns (Edgar using Drill, Sabin using Bum Rush, the rest use normal attacks) didn't help much, especially when it's possible to defeat him even faster (with one attack, in fact).

The opera scene was a masterpiece, that's what I can say. When I saw it, I had never seen anything like than on a video game before. IMHO, it's one of the most beautiful music-related scenes in the series, just like FFX-2's tragic "Thousand Words" scene. The Aria and the dance were marvelous, and the duel music made for Draco vs. Ralse is also great, especially when it plays as the game switches to you trying to save Celes while Draco and Ralse are dueling. Apart from the synth opera voice, which I don't mind as it couldn't have been helped, I think there's only one part about the opera I don't like: Celes suddenly turning into a fully skilled opera singer. It takes 5-10+ years and a lot of practise to be able to sing like a real opera singer, and Celes does it all in 5 minutes? I know this is fantasy, but still...