Having been an ex-pat, and worked with many ex-pats, the truth is that most people from rich-world countries find many things to love about living abroad, and also, secretly think their home country is best and chafe at the annoyances of living elsewhere.
There are, to be sure, exceptions to this--and for obvious reasons, people who actively prefer living abroad are disproportionately represented among ex-pats at any given time, even though most lifetime expats are very happy to go home.
But there is no perfect place that everyone prefers; we tend to prefer whatever we grew up with. Also, Americans who think Europe is unambiguously superior to Europe because they so enjoyed their time there as a student, or vacationing in picturesque tourist spots, are silly.
There is no American patriot like the person who has just tried to cook their Thanksgiving turkey in a Netherlands oven, or dry their clothes in one of those horrid combo units. And even the most ardent America-phile hates dealing with our health insurers.
