I'm not sure about the American bias, as I see tons of non-US cars in the sedans list, but their truck ratings are a travesty:
http://autos.jdpower.com/ratings/quality/trucks.htm
I have been utterly unimpressed with the Silverados and Avalanches. For that kind of money, I expect a lot more than fragile/cheap interiors (Silverado) and the crummy bed on the Avalanche.