It's alright. The minigames are highly polished, and pretty much all of the minigames are good. But that's where my praise ends and mediocrity begins.
It feels to me like they didn't really put a lot of effort into this game. Nothing is new or ambitious. Which on its own isn't a bad thing, but if all of the content is recycled, I expect more of it! There's only five maps, and all the extra content is clearly an afterthought.
Honestly I feel like Mario party 4 (and possibly others) is a better game. And that's sad. It has crazier maps, and more extra content.