Originally Posted by r2473
It is if it works (and often it does).
Good top shots that hit deep in the court and pin your opponent behind the baseline work great IMO. Depth is important. So is weight of shot.
Nobody I've ever faced is doing much damage from deep in the court. Much of my gameplan is hoping and goading my opponent into pulling the trigger from back there.
This is the critical point - if the person using topspin is hitting a heavy ball that is deep, then the opponent is being pushed back, cannot be agressive and when directed to the backhand particularly will generate frequent errors - if they are landing at the service line, then the spin is relatively useless and the person will get hammered by a decent player.