It's certainly an untenable idea, and while I'd agree that the US isn't the best beacon of governance today, I'd also argue that the EU as a whole has not been either and most of the problems are obscured from English-speaking Americans because we don't have the time or language capacity to understand all of the nuance and problems for each member state. It's hard to understand.

On the other hand, the US is big time. We're always on the front page, and so Europeans of course begin to believe they know a lot about American politics and thoughts because they read about it all the time. That leads to outlandish understandings and expectations of the US and so even when you want to start looking at governance comparisons it's hard to have conversations because "defenders" of American systems don't know enough about the EU and European "defenders" of the EU think they know quite a bit about American politics. This leads to a lot of misunderstandings, unfortunately.

The reality is that both systems have pros and cons, and how good each system is really depends on individual circumstances, and even then those circumstances and pros/cons change over time.

To keep the fun part of the conversation going, I actually think the United States and the rest of the Anglosphere should join together in one bloc. Sometimes I fantasize about how different and perhaps better history would have turned out had the American Revolution not happened.