The storyline is simpler than FF6's, and there are far less characters (no switching characters whenever you feel like it) But luckily the characters you DO get you'll become attached to. The job system is purely awesome. Honestly, a Knight with Black Magic? It's like being in class-system heaven! You get to customize your characters quite a bit with this job system (attaching abilities to other jobs! ), making each character unique.
Though it isn't as fun as FF6 (I have to admit that) it is still a very fun, great game to play.