I have always enjoyed post-apocalypse stories and approached 'Earth Abides' as another of those, if a somewhat more subtle one. But it is not another one of those. Stewart had an uncanny perception of the natural world and this permeates every page. He describes a seductive, idyllic existence where humans and nature are inseparable. One criticism is that of the 'cosy catastrophe'. The first sixty pages or so are slow, but stick with it because it contains the most moving and heartbreaking death scene in literature ever. It is difficult to believe that it was written a half-century ago, so little has it dated.
This is a quiet book and attracts little attention to itself even within sf. It has yet to receive the wider praise I am sure it will one day attain. If one book ever deserved to escape the constraints of genre fiction and find favour amongst the mainstream this is it. If everyone in the world read it, it is hard to see how the world would not be a better place.
There are downsides though. 'Earth Abides' may well become the bench mark by which every book you read after it will be compared to and your friends will probably get fed up of you talking about it.
Only shut up when they've read it too.