Single player could have been improved but wifi and mutiplayer more than makes up for it!
The worst thing about single player I could spot was the lack of planets to choose from. You can only go to four until you get all 8 octoliths. Then to Dubliette and fight Gorea. That being said online play is what you should buy the game for. The fact of having the ability to fight players around the world is a really good addition to the DS. Your hunter license is just a bonus.
During online play your battery life dies down pretty fast so make use of your time. The worst part of online play is when those sore losers disconnect while playing so they don’t have to lose. Other than that it is good to be able to give and get hunter licenses. As I said before the wifi is what you buy the game for, everything else are bonuses.