Russell Blackford makes the case for the good parts while noting the flaws. Blackford may have been the first to notice that the book is an anatomy, or Menippean satire, a category defined by Northrop Frye as made up of large books in which the central plot is subsidiary to digressions, copias, lists, set pieces, parodies, and other sideshows, creating a whole larger than the sum of its parts, a quality later noted in William H. Patterson jr. and Andrew Thornton's excellent defense brief, The Martian Named Smith.
Most of the fiction I really love is anatomies, including Ulysses, Gravity's Rainbow, Illuminatus!, Matt Ruff's Sewer, Gas, & Electric, Neil Stephenson's The Cryptonomicon, Paul Di Filippo's Ciphers, John Brunner's Stand on Zanzibar, John Barth's Letters (and other books of his to a lesser extent), The Recognitions, and The Public Burning. With a bit of stretching, we could include my two favorite works of Big Trash, The Carpetbaggers, by Harold Robbins, and The Godfather, by Mario Puzo.
*Good things about Robert Heinlein, besides the obvious:
"Man, as a social animal, can no more escape government than the individual can escape bondage to his bowels."
"Thou Art God": the Martian blasphemy that's also Eastern wisdom.
His innocent observer of Terran culture learned a valuable lesson about humanity from seeing a monkey hit a smaller monkey, who in turn hit a still smaller one.
Long before the 80s, he told a story in which the "amiable nullity" who led the free world was actually controlled by his wife's astrologer.
In one book, he had a character who labored to make things better for all those billions of people because "their lives may not have cosmic significance, but they have feelings. They can hurt." That may or may not have expressed Heinlein's own beliefs at the time, but it perfectly represents the condescension of liberals and their equally genuine compassion. (I am a liberal.)
The possibility that we are all different parts of the same record, being played at different times and in different places (expressed in a letter to Theodore Sturgeon)
The taboo against cannibalism is a good idea because we’re not civilized, so it’s nice to have one fewer way that people can prey on each other.
"When Robert Heinlein invented the term 'grok' to mean simultaneously know, eat, embrace, make love to and incorporate, he was invoking the secret logic of all writing, and the reason it is so comforting to write"—Donna Minkowitz
"waldoes": devices that enable one to pick up and manipulate parts of the physical world without actually touching them. He left it to the reader to realize that the three greatest waldoes are language, mathematics, and science.
Astrology is nowhere near being a science, but a perceptive astrologer can use its symbols as a guiding metaphor to interpret people. (I doubt that it’s much worse than other social sciences. I’d much rather trust my psyche to a good astrologer than a bad Freudian.)
understanding scientific method and using it where it works, but also being able to express nonmaterialistic approaches without sounding like The Weekly World News.
and of course the invaluable intellectual exercise in recognizing the many areas (such as strong sexual dimorphism) in which he was utterly full of shit.