The reason current US politics are so badly received in large parts of the world is that the US make sure that nothing happens in the world without their meddling. We're all affected by what happens in the US.
Many europeans simply won't support the way the US deals with issues like guns, healthcare system, their hard-on towards privatisation, how religion is deeply inrooted in their politics, etc. And this is just social stuff.
mz: The "American System" is such a broad term. What do you even mean by that? Explaining negativity you wonder about isn't difficult. There is more to it than just economics.