One good thing though is the vuvuzela's kind of eliminate home field advantage. Every match is a constant barrage of the horns, so you don't get any team specific cheering, chanting, singing etc. So at least the crowd doesn't play into very much.
And yes, the US definitely lucked out in terms of the road to the semi-finals. They could lose today or in the next game for sure, none of these teams stick or anything. But you can't ask for an easier path to the semi finals. I mean look at Germany-England and Spain-Portugal stuck playing each other in the round of 16 etc.
So we have a golden opportunity, and I hope we make the most of it!