The game's visuals reminded me more times than not of Wii Sports. Granted, the game doesn't use the legless Mii's that are seen on the other system, but everything from the menus to the very cartoony characters (even if they have legs) just seemed to belong on the Wii.
None of this is bad by any means. I enjoyed the bright colors and clean look of the menus, character and court. The looks of this game are one of its greatest assets.
Unlike the visuals, the sound is pretty forgettable. The music is okay, but only enough to get by. The sound effects, on the other hand, are very memorable, just not in a good way. The characters' grunts and other noises have very little variety and are heard often. Quite frankly, this got annoying fast.