Ya i see us beating korea and Us and tying Portugal. I don't know why people all of a sudden have put portugal into the same category of France/Argentina. They are not that good. Who knows, maybe we will win all three games.
As to whether we can go to quarters? Sure. look at our draw. We won't face Brazil, Argentina, or france until the semi's or final. In our half there is Italy and Spain as the favourites. We will play Italy, Mexico or Croatia in the second round. Italy would be the toughest of the three, but none are pushovers. However, i'd rather face those teams, than England, France, Brazil, Argentina. If we play well we can go very far.