I won all the cup in 2 days (tennis only) I wish the tennis portion was a bit deeper. I do think the AI once you get to champion cup is strong and this helps as far as replay value goes. It would have been awesome if you could play all the opponents again after the champion cup is won at the hardest difficulty.
The AI once you reach champions cup (tennis) is probably the best Ai I've ever played on any tennis game. The opponents always play different points almost never predictable. It's a very smart AI
I'm now ranked #1 in both cup challenges and cup matches I have to admit the motion controller feels a lot smoother in Sc2, but its not as accurate as gst2 under pressure or when trying for power shots.. The 1 to 1 gets confused and causes miss hits if you become uncalibrated under pressure. While at times you hold the controller behind you for a power shot and nothing as far as power. I hope they can fix the accuracy of the motion controller and add more cups.