Well I have no interest in debating this. Players are assigned a certain value, that's how it is, and while imperfect it's at least an indication of how good they are (of course other things are factored in, like marketing appeal. But that's not exactly the case of Hulk, Thiago Silva and co). David Luiz may have effed up big time, he really has a discipline problem, but he's still a more talented player than any defender the US has ever produced. Thiago Silva didn't play in that game, and is without shadow of doubt one of the best defenders in the world, nobody in the US comes even close (he is the most valued defender in the history of football, which must mean something). That game was an emotional collapse, something unheard of, and playing at home was actually a huge part of the problem. The game against the Netherlands was the same, the team was beaten before even stepping in the field, and keep in mind their first two goals were illegitimate. The German team isn't that good, as all their other games demonstrate, and the Brazilian team isn't that bad. If you want to judge the players go follow the Spanish League, the Premier League, Bundesliga, the other international tournaments, etc. Don't watch a couple games in the WC and think you have it all figured out.
But as I said, this has already been debated ad nauseam and I have not interest in doing it anymore. If you honestly think the US is as good as Brazil, wait for the next time both teams play in an official game, and I'll gladly bet 10 grand on Brazil. Even with Dunga as a coach. Hell, I'll even take a bet on a friendly match.