Fun Games, Great Multiplayer, All-in-all a great game.
This game is a great party game because you can play up to four players and each event is a good time length. It is probably the best multiplayer Wii game other than Mario Party 8, in my opinion.
Another good feature is the ability to choose which character you want to use. There are 8 characters from Mario's side and 8 from Sonic's side and you can also use the Mii's that are on your Wii.
I would say that this game is a must-get for a family that likes friendly and fun competition or for people that just want to play some Olympic Games with thier buddies.