Fords sold in Europe are mostly European cars (developed and build in Europe for the European market). They are smaller but in many aspects objectively better than most US models.
Fact is, American cars, designed and built for the American market, don't do well in Europe and other markets because the quality levels are sub-standard in comparison with the competition - especially in Europe.
Ford had to re-design models for sale in the European market because European consumers sniffed their noses at American cars - and rightly so, the quality difference between American and European designs really is quite obnoxious to buyers. American standards just don't stand a chance compared to European expectations.
I believe this is no longer the case with newer models since Ford spun off Volvo.