Not as hard as Gamespot say!!
How they think it is that hard is beyond me. Has the reviewer never picked up a racquet and hit a few balls on a tennis court in real life? It's the only way you would have absolutely no clue how to hit the ball in this game. For me having played tennis before in real life i found it very easy to hit the ball with topspin or slice.
Admittedly i only played two player and have not tried the career mode against the computer so this may be harder but my friend who owns the game has done his career and is winning the tournaments so it can't be that hard can it cos he sucks at tennis in real life hehe ;)
So get a grip gamespot your rapidly turning me into an IGN head with your extremely harsh reviews of some games like UFC and now this