Roddick is garbage and his style of play has been copied by most Americans, which is why the US is a non factor in the tennis world at this point in time. Big servers, not much else. Can't create points, can't stay in long rallies, weak groundstrokes, inability or unwillingness to come to net and be aggressive.
If you just watched the Nadal-Verdasco match, you realize just how good these players are. Then watch Roddick and you realize how far he has to go to be at the top. His best days and results are behind him. Hopefully there are some good juniors coming up, US tennis is sorely lacking.