DS blows.

Lufia
Advance Wars: Days of awesome fucking music
Castlevania: Dawn
Bangai-O Spirits
Contra 4
Commando: Steel Disaster
Tetris DS (multiplayer + catch mode)
DS flash card
Valkyrie Profile: Covenant of the Plume (and only because it's so...evil...)
Honeycomb Beat

If it weren't for the GBA slot, the DS would be nigh upon worthless. A flash card used purely for SNES/GEN emulation is infinitely more useful than any ten DS games. I bought a PSP with the intention of cracking it for emulation, but I ended up just playing a shitton of PSP games instead (because there's actually a shitton of really great PSP games!).