Are you using manual controls? I used to beat the cpu in Superstar, but since I started playing again I had to lower the difficulty down to Professional, because I felt that in Superstar and Top player the cpu cheats a lot and doesn't miss a shot once inside the penalty area. In Professional the cpu plays a lot more realistic to me now. But only with manual controls. If I play with assisted controls I can still beat the cpu easy on any difficulty setting.