Not my favorite DQ game but still good
The main objective of this game is the Wifi function. If you don't plan on hooking up to the internet, then it's probably not worth it.
The good news is, you can keep playing this game and keep getting stronger hidden dungeon maps, etc, after you've cleared the main storyline. In short, this game is what you make of it.
Still, I would argue they tried to put too much into this game and I felt it was a little scattered and lacked focus. They brought in the alchemy from DQ8, customized characters like DQ3 (ie no character development), and did away with the casino. I actually didn't mind that they did away with the casino this time around because to me that was also just a necessary evil in this series.
If you're looking for a straight forward RPG, then you will probably be disappointed with this game. But I still think it was enjoyable worth the buy.