Overall, I think the reviews for most if not all the DS games have been very very critical and hard on the handheld.
First they assume every game must use all the DS functions or its not a DS game. Second, they expect perfectly polished gameplay, but also demands innovative unique play experiences, since the DS is somewhat different and revolutionary system.
Basically, they are judging the games, by what they think or thought they should have been...well give the developers time. But while you are waiting.
Go pick up
Madden: you have a good portable football game.
Asphalt: You have a good racing game to play on the DS.
Spiderman: You have a difficult, but enjoyable sidescrolling action game.
Mr Diller: A simple and addictive Puzzle game, that brings options to the table.
I say the important thing is to enjoy the games, and if you play something and have fun with it...who really cares about the reviews.