Was FF6 really the best Final Fantasy of all time?

"Bleh! You people make me sick! You sound like lines from a self-help book!

If that's how it's going to be...

I'll snuff them all out! Every last one of your sickening, happy little reasons for living!"

Okay, here's the deal. Final Fantasy VI. I hear that it's the best Final Fantasy mainline game available, if not one of the best JRPG's of all time.

Tell me why. What was so great about this game?