You can ask questions in such a way as to tilt a poll in any direction you'd like. That's what happened in 2016. The data out is only as good as the data in.
Look at the methodology and attributes that were used to determine the "best countries". It's obviously skewed to give favor to socialism.
Ask that question another way and see what answer you'd get.
For instance. What country has done the most to defeat tyranny, facsism, communism and improve the human condition within it's own borders and across the globe in the last 250 years?
Germany, Japan and Switzerland(for different reasons) damn sure won't make the top 5
Do any search you want for greatest documents in the world. Use your own term of importance be it political, social, world changing whatever. #1 will universally be the Magna Carta. After that the Declaration of Independence, the Constitution and the Emancipation Proclamation come in not far behind regardless of the slant.
This country has a lot of faults but yes our system of government is second to none. The biggest fault is that most citizens don't take part. They take the liberties we have for granted and are complacent about defending them the way our founders did and set us up to be able to do at any point.
Even our Constitution is not perfect. It's required amending and can you imagine the incredible difficulty of voting for a 3/5 compromise in order to get the country up and running? Even the founders couldn't agree on that one point which today seems absurd. They found a way to make it work and left it to future generations to fix. That's courage in my opinion. I can't imagine the anguish of those founders who had to vote for that one point alone despite knowing it was inherently wrong. It also goes to show that context matters. It was a different time.
Removing context from history is a way of minimizing it. It would be like saying we kicked Germany's ass. That would make us sound like a bully but in the context of defeating fascism and one of the most despicable humans ever no one disagrees that it was the right thing to do. Hell, few disagree, for that matter, that it was the right thing to do to ally with one of the other most despicable humans ever to do it. History matters, context matters, lives matter. All lives. The absurdity of the 3/5 compromise is all you need to consider when now some are saying that some lives matter more than others.