Are there any games for the Wii that are similar to Mario Party 8?

As for party games, it is pretty much in a class of its own. For the same amount of fun and party game atmosphere I would suggest Mario and Sonic at the olympic games, and Rayman raging rabbits(something like that). Those games are the closest to Mario party in fun. Rayman gets very boring and repetitive after a short while, but the Olympics is very fun and replayable.

There's Wario Ware Smooth Moves, Rayman Raving Rabbits, and Super Monkey Ball. Those are the only similar games I know of.

Well... Mario party 8 is one of a kind. There is mario party 5, 6, 7 for the gamecube. If you like the Multi. player part then i say mario and sonic at the Olympic games. It really depends what you like most about the game...