My favourite game on DS is Metroid Prime Hunters. I just clocked it yesterday, but there's one teeny-tiny problem. Actually, there ay be a few...
The game should be longer. If you've played Metroid Prime Hunters before, you'll see that there are only four planets which you have to visit. You have to visit each one twice, except for one plane called Alinos, in which you have to visit three times. I wish it were longer.
The story line is not consistent with that of other Metroid Prime games. I clocked the game and was so happy with myself, and thought I knew everything about Metroid. NOT! The main series was talking about Space Pirates and Metroids, and I had no idea what they were.
There are major restrictions on WiFi multiplayer. For example, you can only play one game mode when battling other random people. If you want to have access to all the game modes, you need to host a game with friends. Same thing goes for voice-chat. Just when Nintendo creates a revolutionary for the DS, they stuff it up with security. Like someone's going to violate you over a microphone while they're halfway across the world.
Otherwise, the game's a perfect game to play, and you should try it! Ignore the fact that you can't voice-chat to strangers. Also ignore the fact that you have only one game mode to play with strangers. I know that Nintendo is trying to protect our interests, but they did rate the game for teenagers, so how much protection do teenagers need?