All said, It's and "Ok" 6.5 - 7.5 game.

User Rating: 7 | Star Fox Command DS
I got SFC in a bundle when buying my DS. As I started getting into the story mode, I almost was immediately stopped by the difficulty I found in following the missle slipstream (third world, I think) by commanding your ship with the stylus. As a handheld game, I think that boss fight would have been better saved for a console, such as the Wii. Commanding your ship by the stylus is cool most of the time, but when your hand gets in the way, or an off-set touch screen could mean death for Mr. Fox.
The online play is nice, considering some other games that need friend codes and the like. But the online is also dissapointing because of its matchmaking. When I was just starting out, and at a rank of X or Y, the wifi matched me up with all expert players (including a C!).
SFC does easily allow you acsess to play with your friends through one card, which, if you can find a friend or two willing to play, can be fun.

All said, I wouldn't pay much more than $15 (US) for Star Fox Command, as I really only use it for the online wifi play