To me, pushers are simply comfortable in their ways and know their limits. A pusher says: "I know I can't hit beautiful, 70 mph winners -- so I don't even try."
There's nothing wrong with that. If you want to get better, then its always best to know what your strengths and weaknesses are. A pusher knows that his or her strength lies in consistency.
I love playing against pushers. I love winning because I played well and was able to earn points through hitting winners and drawing a forced error.
On the flip side, I hate playing against ball bashers who have no control and every 3rd shot goes into the net or sails long. It's no fun for me to win by default because the other guy couldn't hit the ball over the net.