Star Fox does have 3 difficulty settings and several medal challanges, and my reply is...so what? I don't want to collect every single token on a platformer to extend the play-life. As I've stated before, Star Fox is a cute but extremely average game that can be completed in a very short time. The other three characters on your squad do absolutely nothing for the gameplay, and in the end, it's all about gameplay, which Star Fox has in short supply.
After reading that statement I'm sorry you never got a chance to play the multiplayer with 4 friends battling it out in an awesome, chaotic rock (tank), paper (little guy), scissor (Ar-Wing) battle.
Me and my friend would team up as guys against my brother and his arwing. Good times