WUOC Long terrain was really fast. Although terrain was karstic, that was not the "hard karst" like you can find in Slovenia (check this map:
http://force.rutka.net/gadget/cgi-bin/reitti.cgi?a...). Depressions were big and terrain was not very detailed, so it was quite easy to navigate and it was easy to run fast.
I think WUOC got rid of most of the outsiders this year and it was quite an elite event.
About the USA team ... I was one of the few guys that was beaten a few times by Americans ... As I could see in the forrest, the team has a lot of potential - but they should start working really hard on the technique! This is what kept (at least the men team) behind.