Sadly, no one is really playing. You have to play yourself (or maybe a friend if you have one) if you want to play/get medals.
There are a few bugs (possibly by playing over and over to get the 50 wins)
1) The ball can get stuck in a loop and can be very unpredictable (but at least it breaks the loop).
2) The win count is very weird. Some games will not award wins at all, some may even take away a win. Some games will award BOTH players with a win.
3) The paddle can be somewhat bugged. The ball went though on a few occasions. In one game my paddle didn't spawn at all. I often see a fake extra paddle on my screen and incorrect placement of the opponent's paddle.