Not worth it
The Madden Franchise has really outdone itself and made itself the best football game available. The problem is, this doesn't translate to the DS very well. The graphics are terrible, the sounds is terrible and the controls are terrible.
You do have a lot of options like you have in the other versions of the game but what EA needs to do is "dumb-it-down" for the handheld. They try hard to do a straight conversion from the Xbox 360 to the DS is seems like. Madden 09 is just to complex for a handheld and would need to go the more arcade route similar to Tecmo Bowl Kickoff. If you like football games, stick with playing it on the PS3 or Xbox 360.