Incredible tennis game. The single player game is so feature-rich and interesting that it actually makes you personally interested in developing your character. Not only skill-wise, but also finding the coolest clothes to match his cool style on the court, and silly things like that.
The gameplay is accessible, but incredibly deep. Against harder opponents (which is many people on Xbox Live), you will need to be able to aim balls with a very subtle touch. Timing is crucial, and it's the little things that will win the game for you. It takes reflexes, finesse, and strategy...which is a testament to how well this game models the real sport of tennis.
The sheer number of courts is amazing, and each one is a sight to behold. The sounds of hitting the ball are sharp and satisfying, and the game just feels very fluid overall. My only complaints would be the frequent and long loading times and the constant interruptions from the "attitude" screens. But if you have some measure of patience, it will hardly keep you from enjoying this polished and fun game immensely.