Dont critise them yet.
They could indeed be working on much more advanced controlls then WiiTennis.
WiiTennis is great, but hardly accurate to real life. (you cant really hit the ball "upwards" can you?).
IF Rochstar are attempting to correlate wiimote movement to racket movement to ball physics, that could indeed be quite an advancement.
(and just the sort of advancement Wii owners should be looking for in games!).
Its dissapointing theres no two player online, but they could be truthfull if they say they are working on "All the focus is going into making it the most advanced control system on the Wii."