I think the problem here is that some half of the DS users (according to Nintendo) are female. That's why stuff like Leyton and Cooking Mama charted better than Chinatown Wars. I think Rockstar themselves said they hoped Chinatown Wars would expand DS audience...
And maybe it will, even though the opening was less than impressive. There's a DSi launch in a few days, and maybe people will pick up CTW with it...







