I have played mario party before, but it wasnt that great. I think with the Wiimote it will be great, but not much different than Wario Ware. I mean, the game is basically minigames showing off the wiimotes potential and various uses.
I think they shouldve implemented online into mario party 8, but nonetheless, this will be a great game and I'll get it once I get my 4th wiimote so that i can play with my friends to it's full potential.