I sold my ds. For all the hype almost all the ds games I have had, mostly none of them delivered at all. New Super Mario Bros. was average fluff. Hotel Dusk is a highly average adventure game. Castlevania: DoS sucks. Contact is meh. Mega Man ZX is pretty suck.
Almost all of these games are 'OMG OMG OMG REAL GAMERS MUST GET DIS" games at gaf, and I don't see what the big deal is at all.
The only ds games I've moderately enjoyed were PW series, Kirby Canvas Curse, Elite Beat Agents, and Castlevania: PoR. And even then, PW is a highly average game when it comes to adventure games, but I still enjoy it because it has charm.