Metroid Prime: Hunters is a great game for the DS, but may be dissapointing depending on what you're looking for.
Hunters' main feature is the online gameplay. It's not that different from any other online FPS though. Obviously the touch screen offers a new way to play, but it can be tough to get used to and still annoying once you are used to it. If you've mastered the feature however, it can be quite fun.
But not having a Main One Player mode can be annoying. MP:H does have a 1 Player mode, but it's very dissapointing. At the very most, it'll take you 3-4 hours to finish it. Also, there's only four worlds to explore and they're all dissapointing at the very least.
My personal favorite thing about the game, not having any siblings who play games, would have to be that you can play multiplayer with yourself and 1-3 bots. This mode is pretty customizable and doesn't get old easily. If they took away this part of the game, I probably would've returned the game before I'd even had it for a week.
Graphically, the game could be better but is still one of the best on the DS. While not overwhelmingly eye catching, they still pack a punch.
Not too much to talk about with this game, if you're a fan of online gaming it's perfect for you, but if not you might want to stay away from this DS title.