As a party game Mario & Sonic BDOS is thoroughly recommended and should be in every Wii games.
Two downer but there is:
1. There is only a low to middling difficulty. With practice (one to two games afternoons) you're as fit in the various disciplines that one breaks the world records and no more challenges in the game. In this respect, a pity, here you could set the difficulty from the outset a little higher.
2. There are, unfortunately, and inexplicably no "Olympic Mode": Something like Decathlon (= ten different disciplines), or even an international match (two or more players are all fighting disciplines against each other; who at the end with the most points is the winner) there are unfortunately not.
Consequently: More players play - unrestricted recommendation; Single game - only short fun. In this respect there is only 4 stars.
Important: This game is sure to play with two controllers and two Nunchuk! If there is only one controller, or only a Nunchuk - necessarily upgrade with purchase of the game also two complete sets!
Since almost all the games are to be played with Nunchuk and you should play the game in pairs (min.), Is likely is likely to be tarnished badly with only a complete controller-set party fun.