way to simple,
what Guitarherbeast menas is you have no control over scoring, it lacks the spin capability, it all depends on where the opponent happens to be, in a good pong game it will go in different directions based on how you hit the ball, (center will continue as if hitting a wall, top or bottom of paddle will make it go back on itself,
And yes, i have seen 4 way pong, team pong, battle pong, and a variety of others more original than this