Here's quite a big list of DS games I enjoyed or think they are good:
GTA: Chinatown Wars.
Professor Layton and the mysterious village.
WarioWare: Touched.
Advanced Wars: Dual Strike.
Advanced Wars: Days of Ruin.
Castlevania: Dawn of Sorrow.
Mario Kart DS.
New Super Mario Bros.
The Legend of Zelda: Phantom Hourglass.
Fire Emblem: Shadow Dragon.
Metroid Prime: Hunters.
Pokémon Diamond/Pearl/Platinum.
Moon.
Dragon Quest 4 and 5.
Final Fantasy 3,4.
Blue Dragon +.
Super Mario 64 DS.
Eehrm... I have to say, and yes this is serious, WarioWare is BY FAR the Best DS game there is! I swear to god! It's the god of all minigames! Total <3 for that game!!!!!!!!!!!
THE NETHERLANDS