Based on reviews, this isn't a regular JRPG (like the original Blue Dragon was). In fact, most of the reviews indicate that it's pretty bad. I'd say it's probably not worth more than 5 bucks (if even that?).
The new DS Blue Dragon game is supposed to be much better.
Yes, this is a strategy game, not an RPG, and very poorly reviewed. I don't like strategy games. I'm looking forward to the new Blue Dragon though, which goes back to being an RPG.