Do not buy if you don't have friends
Rayman Raving Rabbids's is the first of what will be many party games. Centering around the adventures of Rayman, the lovable man that lacks joints and his zany adventures against insanity, this is a game the whole family can love. Are you gagging a little bit? It's okay, I won't hold it against you. This game can induce some level of sickness when you start to really look at it.
In essence this is a game that you need people to play with. Think a little Warioware but not as good with some third-party characters sprinkled in. This game allows you to have a good deal of fun with your friends, but may I recommend some booze. While I don't usually support drinking before a game, thats the only way this game is going to stay interesting after the first 25 minutes.
In conclusion, this game has nothing wrong with it. It also has nothing great going for it. Rent it if Wii Sports has gotten too boring for you. Go buy Wario if you want an awesome game in the genre for the Wii. In the end, this is a forgettable game.