Its rather good....
I've played it for a while, almost number one in the ranking.
Pros:
It has a nice career mode where you start as a low ranking player and try to get to number one.
Graphics and sound wise is very good.
Real Players have similiar playing styles to the real counterparts (Pete uses Serve and Volley alot)
Has real players.
Good rallies.
Cons:
Career mode doesn't allow to play doubles.
Easy (I thought so)
No official tournaments.
Cant do kick serves (at least I'm not able to)
Easy to keep the ball in play.
General:
Serves often go long if you try for the corner or the T.
4 types of strokes, (lob, slice, top, flat)
IF you should buy it? Well, the xbox is rather cheap right now, I wouldn't buy it jsut for this game, but if there are a couple more you like along with TopSpin, then you should, if it's only for TopSpin, stick with your PS2