For the most part, I found it hilarious! It's sad that many people across the way will watch that and think that's what the US is, but ignorance happens.
I watched the entire episode intently. I think the highlight of that special edition was the things they said/did that you could never get away with on US TV for fear of not being PC. This certainly would not fly on US TV: The removal method of the cow from the Camaro. Magnificent.
The US's only contribution to western civilization... right on red. That's pretty funny! So was fat Stig.
Check this out too. "Sweet Home Alabama"
http://www.topgear.com/blogs/planettopgear/027-sweet-home-alabama/