Hi,
The more reputable reviews and surveys are the ones you can take seriously! they're the ones which analyse and look at multiple facets to each country and place rankings based on a mixture of elements.
Look at the U.N reports and Forbes for instance, Check reputable economic type websites and their subsections - Financial Times etc.
It's the tier of reporting under that, which Comoscato points out is the more skewed findings and reports you'll read, one rates Canada as the best, but with a skewed to an extent viewpoint from 'British Expats' - well yes, Expats like that aren't exactly going to vote the UK very highly now are they!
the trick is to find as independent articles and research from as independent companies, reporting and analysts.
Fundamentally, there isn't a 'best place to live' as everyone is different - however when placed in those judging criteria, then it does help formulate an opinion for individuals to take on for themselves! for instance, for me, the 'best' place is Canada

Cheers, DtM! West London & Slough UK!