People aren't expecting Poland to outplay Argentina. But they aren't all bad players, the team is still mostly footballers from the top 5 leagues with the exception of central midfield.
But Poland had no serious intention of scoring yesterday, in the most part any chance of a break was refused in favour of keeping everyone back and hoping Lewa would somehow keep the ball and do something despite the attentions of the entire Argentina defence because they didn't need to worry about covering supporting runs. And it's not like there were no chances to break, Argentina had some lazy passing in the first half.