These rankings are absolutely useless! You never know which to trust, and sometimes you wonder if these people that work on the rankings have ever actually stepped foot in these cities and/or countries.
2010 Quality of Life Index: 194 Countries Ranked and Rated to Reveal the Best Places to Live – International Living
Look at this article for example! France has been first for the past 5 years! I've been living in France, Paris for 4 years now, and the way they describe Paris makes me think these people judged Paris from romantic movies, poems or stories! Life in Paris is nowhere near as glamorous as they say, unless of course you're a millionaire! In which case, you can make almost any city/town you live in to be glamorous!