US taxes on average-ish incomes are definitely among the lowest in the OECD (as expected): http://www.pewresearch.org/fact-tank/2017/10/24/among-develo...
I am not an American, nor that knowledgeable about their tax system, but my impression is that their system has a lot of layers (like state/county/local), which might make it unfair just to compare national level taxes.
I always feel like tax should be measured in "if my employer pays 100 extra, how much more can I give another company for a good/service".
I don't know about US but for Germany the answer is between 25 and 40 depending on how low your income is and what your family situation is.