When I bought this game I was a bit hesitant but after playing a while I found it to be a damn good game. The combat system is very good, it allows you to make your own custom combos for huge damage. The storyline is great, it makes you care about the characters and take interest in their stories.
The online play is what makes this game brilliant for me, a friend and myself bought a copy each, i play a healer/buffer type and he plays a melee tank/dps guy and we work together to do quests and kill boss mobs. You can build your own town and populate it with civilians, join peoples guilds and form up friendships. There is so much more to this game than just a regular RPG.
The only downside for me is that the main game is very easy and doesn't offer much of a challenge to experienced RGP players, but all in all. Definately worth a buy! its only cheap :)