Blue Dragon was the worst demo I ever played. I absolutely despised it.
Then I bought the game. After playing for several hours, I suddenly realized that it's one of the best JPRGs I have played in years.
The only downside is that it seems too easy. Luckily, there's a free patch that steps up the difficulty level.
Here is my review of the game, though even I am a little embarased to post this after my recent writings:
http://www.theancientgamer.com/index.php?/site/comments/blue_dragon/
Or check out my new webcomic: http://selfcentent.com/