Part of the problem is having judges from non-competitive countries. Somehow, I think that Russians, Romanians, American, Chinese, Japanese, etc. might be fairer in scoring, knowing their programs are considered top rate and reputable (ok, maybe not quite on Chinese ages). It seems that the most extreme bias comes from countries that have no viable gymnastics programs, medal-wise.
Not surprising that it was the Greek judge who gave the most deductions to Nastia. Greece has been anti-American since 1948 and it's become almost expected of them by now.