The main problem with the game is its lack of depth as far as characters and gameplay. It's a nice alternative to the typical sports game but it probably won't have the legs to get over with the more fickle N64 owner. Progressive levels of singles and doubles competition. 2 special shots for each character. 8 different clay, grass and indoor courts from around the world.
Tennis is one sport that makes a great videogame because of the speed and intricacies of the game.
It's just a matter of wrist angle that determines whether a ball is in or out. The toughest part of AST is that the control system requires you to move your character all over the court and direct the shot with the analog stick. What most players will end up doing is navigating the player to the right place on the court and hitting the A, B or C-down button to begin the racket swinging animation and then holding the control stick in the direction you want the shot to go. All of this happens in less than a second, which isn't a problem for the typical gamer's hand-eye coordination. The problem is that AST has a little trouble keeping track of when you're doing what.