The average effective corporate tax rate is also quite a bit higher for the US than other developed countries; according to a report by PricewaterhouseCoopers and the World Bank, 27.9% versus an OECD average of 15.9%. [1 citing 2] The right wing think-tank AEI reported a smaller disparity of about 9% a few years earlier. [3] For what it's worth, these rates are fairly variable over the years.
So "huge numbers" seems like quite a stretch.
Moreover, I used the broader term "policies" rather than "rates" for a reason. The US's worldwide taxation scheme, for instance, is in itself problematic.
[1] http://barbwire.com/2014/10/15/analysis-are-us-corporate-tax...
[2] http://www.doingbusiness.org/~/media/GIAWB/Doing%20Business/...
[3] http://www.aei.org/article/economics/fiscal-policy/taxes/rep...