Grand Slam isn't really 1:1, and as others have said it takes practice before you can get the ball where you want it to go. That said, once you're in the swing of things (some pun intended) it works pretty good: just remember to take the game at its own terms and you'll be fine.
I haven't played VT, but I hopped on the Grand Slam train because the developers were eager to show their game off, while Sega's still pretty mum about Virtua Tennis, and that alarms me.







