GameSpot- Overall, Mario Party 9 is a decent package with a lot of content, even if the Story mode is something you'll wish you could avoid. It's colorful, good looking, and fun with others, but after so many games, the appeal just isn't going to last for many people. There's no denying that what Mario Party 9 does, it largely does well; it's just that it's largely been doing it well for nine console games and two handheld games.
Once you've spent a few hours with mates, seen all the different boards, and played all the minigames, there's very little incentive to return. Much like that high school reunion, it is fun for a night, but you won't have any hesitation about moving on.