I don't know. IGN didn't have an issue with it. It is definitevely NOT 1:1, but it provides much more control than wii sports.
Personally I would love a 1:1 tenis game, but I suck at it in real life, and games are suppose to provide you with fantasy skills. So I think it's better if is not one to one.
"¿Por qué justo a mí tenía que tocarme ser yo?"