Normally, if you want someone to really wallop you in pool, you need to go to a potentially-seedy pool hall and find a pool shark willing to relieve you of some money. And really, do you want to go through the trouble of all that? It would be so much easier if you could just play against a robot programmed to play pool perfectly.
Well, that's just what the PR2 robot is. It's able to examine a table and figure out exactly how to play a game to knock the balls in. It's all geometry, after all, so it shouldn't be too tough for a robot to pull off. And knowing that you're playing against perfection should relieve you of some of that pressure to win and let you just enjoy the game.