I didn't like the controls on the game, granted I rented it for my little sister in law and thought the game and mini-games would be fun. She didn't like it at all so I only really played the single player a for a few short tries.
I was reading IGN's review of the Step & Roll game, and they say the balance board controls work, but it is a lot harder. They remove obstacles to make it "fair" compared to using the Wii Remote. They also said the controls were essentially the same between the two games.