Leveling is a bit slow, but if you like teaming up with others and fight, I'd say it's worth it. If you think the story and such is all that matters, and don't really care too much about fighting a lot, you might not find it all that amazing.

I personally think the battles in this game are really fun.

You'll need a lot of spare time though, cause it's not something you can get to the end to in a few months.