@France9: I think you should definitely get it (costs $50 new). It's different from the other Mario Party games because in this one, all players move together in a car (or flying carpet, or bed)! Even if one person dominates in the mini-games, the placement rankings are constantly changing due to a lot of random elements being thrown in.
The last time I played with my hubby, we got stuck going around in circles on the Boo level because we needed a certain roll to proceed to the next area. It was hilarious!