Mario Party DS impressions at Hooked Gamers.

"If you have ever played a Mario Party game, you pretty much know what to expect here. Not much has changed in Mario Party DS. However, instead of changing a winning (or losing, your preference) formula, Mario Party DS simply tweaks a few of the gameplay designs and pacing (for the greater good, most will agree), downgrades the graphics for the handheld's weaker hardware, and adds basic touch screen controls and then basically calls it a day. One thing that will bother lots of people is that a lot of the obvious enhancements are left out. Namely, online play, and better item balance."

Full Source: Hooked Gamers via Gonintendo