I’d say it’s Heinlein’s best, and certainly one of the best SF novels ever.
But I gotta admit that as I grow older and crankier (who, me? ;)), his botch of basic probability in The Moon is a Harsh Mistress bothers me more and more.
They start off with a one-in-seven chance of pulling off The Revolution, but the odds against them get steadily steeper for no apparent reason. Heinlein’s explanation, through Mike, is that the fact that they’re taking necessary risks doesn’t change the fact that they’re risks.
Nice, but: either those risks were baked in from the beginning, in which case the fact that they’re about to roll the dice in a way they would have expected to have to do, even if all went well, which shouldn’t change the current odds against them; or they’re having to take additional risks due to things having gone wrong along the way, which should have been reflected in the plot.
But the only thing that goes badly for them between the time Manny, Mike, Prof, and Wyoh declare the Revolution, and the time Manny, Prof, and Stu go to Earth is their failure in finding Earthside contacts, which their friendship with Stu rectifies.
But instead of the odds having been somewhat shorter than 6-1 against (another gripe: Heinlein has his characters use “one in seven” and “seven to one” interchangeably) at the point where they’re readying their trip to Earth, which would have made sense, they’re over 100-1 against. This of course makes no sense at all, probabilistically speaking.
And this is from a guy who famously said, “Anyone who cannot cope with mathematics is not fully human. At best, he is a tolerable subhuman who has learned to wear his shoes, bathe, and not make messes in the house.”
Oops.