Actually, compared to a lot of the pseudo science that usually gets posted around here this survey seems to be fairly well balanced.
I am not quite sure I buy into the economic well-being dimension as they indicated in the explanation that they don't use a strict GDP or purchasing power guideline.
This means that a person in Singapore who buys a million dollar flat and can only afford one 100,000 dollar toyota "feels" about the same as an American with a 300,000 dollar 4,000 square foot house with two cars and an RV out front.
As an American I don't care where we rank but looking at the list the only place above the US on the list that I would remotely consider immigrating to is Australia.
I am in Singapore as an expat for the money - period. Immigrate here for a better life? Fuggedahboudit...