First off, the graphics are very good, it looks great. It has a fair amount of real players too, and also some made up players, which is good because it adds variation instead of playing all the best people all the time (like on Virtua Tennis 3).
The career mode is fairly decent, and keeps you occupied. I don't really rate the player ratings, I think they are a bit of a waste of time.
The best part is the realistic gameplay. When you're out of position, you hit bad shots. When you're in a good position, you hit decent shots. If you hit it late, it goes out or hits the net. If you hit it early, you lose power. It is just like playing a real game of tennis.
However, this realistic gameplay means you will be rallying for ages and ages, just for one point. That means it gets so boring, and takes ages just to win a match. Now I know this is realistic too, but itjust makes it boring to play.
Overall though, it wipes the floor with Virtua Tennis 3 in every single way. You can't keep diving and hit shots from miles out, and you don't just play against the best on every career match. It does lack career training, and it can get boring, but it is a fairly decent game.