The worst record was in Japan. That was also the smallest number of head-to-head match ups. Most peer nations sent fewer runners to Japan than normal. Just a guess, those who went tended to be a bit stronger.
The best record was in Ukraine. With just a quick glance at the 2007 results, what stands out is good records against Japan (11-3) and Canada (12-6).
The record from 2008 (28-60) is the second best of the 4 results. But, as a fan following the WOC, it didn't feel like that. It felt a bit disappointing. It felt like the team could have - even should have - done better.
It looks like the long qualifying races have been the discipline where the US tends to do best against the peer nations.