all in all, a great game in all aspects
first off its presentation style is very appealing and charming. the character models and courts available have been done up well and vary in many aspects to keep it interesting no matter how long into the game you have been playing.
it also features very realistic tennis gameplay and mechanics. contrary to what many people thought.
and it also has very interesting mini-games available that help you in your ball placing, running, shot making. because of its presentation, it doesnt feel so much as a tutorial but more like you're playing tennis with the computer itself, but without having to win any points.
the only bad spot of the game is that it leans too a little too much towards the easy side. abd if you dont understand Japanese, then you wont be able to fully appreciate what the game has to offer. and lastly, when they make you play at the opposite end of the court just to make things harder, its quite irritating and you will feel that it was done only to compensate for the lack of good AI.