One of the best RPGs ever made
I'll briefly describe the main mechanics that sets it apart from other RPGs:
Battles are not random like FF, instead you have to run into a monster to fight it.
"Timed hits" are similar to those in FF8, except instead of doing more damage, you get a follow up hit. If you time the special moves however, you can get either.
Instead of MP, you get FP, which is shared by everybody.
And, the game has a great feel because the storyline is smooth and chronological. The side games are fun as well.
Best of all, you get great rewards for reaping the side quests.