Yeah, they did quite well, I think. Too bad the referee sucked so badly. The goal he didn't count was completely legal, he didn't allow the game to be continued when the US were having a quite interesting attack and the opponent fouled one of them (but the attack kept going) - and he didn't even give a card! I've seen about 4 offsides that weren't (on both sides).
They were lucky (though they deserved it) to win the match after all.
Too bad Serbia wasn't lucky enough to get the penalty where they should have - if they'd have gotten it and scored, they would've been qualified...
I support the Netherlands first, as I live there. I support the US next, because I love the country and would love to move there if I ever can.