The back of the book proclaims it 'attacks all the religious explanations of faith... undermines the idea of sexual relations based on jealousy... pokes a bitter satirical finger at the materialists and politicians.'
The front says (on my version anyway) 'the most famous science fantasy novel of all time.'
I like Heinlein, I do (I have to say that or the League of Science Fiction Fans will get me) and I particularly enjoyed The Puppet Masters and Starship Troopers. However, The Moon is a Harsh Mistress I didn't like quite so much. The book was very well written but I felt that story line and character were pushed aside in favour of Heinlein's views and I am not a fan of books that do this. If there is a message - and really, what book doesn't have one of some sort? - I prefer it to be subtly written into the plot rather than the novel being used as a soap box for the author. And yes, I like action in books. If I want to read about philosophy and politics I will read a non fiction book, magazine or newspaper.
With that in mind, I feel I am obliged to read this book because it is so famous. I find the language quite dated and while I'm sure it was ground breaking in the sixties, parts of it seem quaint by today's standards. However, I am being entertained (so far).