A fun game that should keep you entertained for a while.
The graphics are 3D and interesting and are great when you consider the DS being so not next gen. You can really tell what's what and who's who. I think that Phantom Hourglass wins still but DKRDS is a pretty close second or third.
There's a lot to do in Diddy Kong Racing DS, but sometimes unlocking things can be hell! The best parts of Diddy Kong Racing DS are probably the boss fights which are just average races but are challenging and fun.
Pros: Good graphics and gameplay. Plenty to do. A bunch of vehicles. Bosses are fun. Lot's to unlock.
Cons: But unlocking things can be frusturating. Your goal isn't always clear. Some races are hell.
I'd say check it out because it's a pretty fun game.