The job system is the thing that stands out the most. There's a great selection of jobs/abilities, & as mentioned before, it's pretty cool to mix & match.

Another thing that is great is the cast of characters. Not just the main 4, but the NPCs are fun, too.

I also love the enemies. Square should've used the SkullEaters again in other games, a la Tonberrys & Cactuars. I guess there's no love for The World's Most Deadliest Chipmunks.