I really don't consider ANY game perfect, since each has their own flaws and their downsides. The one's that has come closest?
Apart from being the first RPG game that I played, it's story is VERY deep, the esper system is very intuitive and it makes the game a lot of fun to play. The Characters have their own motives and each character is fairly well developed (with the exception of the last few characters). With so many characters, I'm surprised that Square had the time and patience to develop each one. Also, Mog is friggin playable! He's a friggin playable character. And possibly the only moogle that is playable until Final Fantasy Tactics Advance came out.
The soundtrack is also one of the best I've ever heard. I'd say it's probably Uematsu's best work.
How ya doing, buddy?