Ghana has speed, so maybe Arena was going "conservative" for his line-up?
Frankly the U.S. doesn't have a "star", that can make things happen. Just about every team that's advanced has at least one...Ballack (even though he's meh so far), Ronaldinjo, Figo, etc.
Look, if we took soccer seriously (so to speak) and didn't have other sports to detract from it, like baseball, basketball, football, we'd be putting out a pretty good team every time. But seeing as the U.S. already has a monopoly on the Olympics, it's probably better to let the rest of the world not to have another reason to hate us and have their "futbol".