Very good Mario sports game!!!!!!
First is the gameplay. It isn't so hard to win if I use a speed character (I use Koopa Troopa). Good multiplayer too!!! There are some cool minigames like "Artist on the Court" and more like defeating a Mecha Bowser with tennis balls (don't lose all your health!).
Then there's the graphics. They're very good. Most of the graphics are great except for the audience obviously.
I don't have much to say, but if you're a Mario fan and like his sports games too, then buy this.