As a new player, you may not notice differences. Every world has a random player generation. Some worlds have more "superstars" than others. Just because a guy with certain raitings plays poorly in some worlds doesn't mean a guy with the same ratings doesn't star in another. The game is based on player ratings. Since each world is completely separate, the ratings are relative within the world only. So if you start HBD as a newbie, you won't really see any difference.