Jo Walton writes about Heinlein’s Worst Novel. I 98% agree.
My favorite Heinleins are his early books, particularly “Citizen of the Galaxy.”
I loved “The Moon Is a Harsh Mistress” and “Starship Troopers,” but I’d love them even more without the lectures.
I loved “Stranger in a Strange Land” when I was 13 years old, but it ages badly.
And “The Cat Who Walks Through Walls” and “To Sail Beyond the Sunset” are just plain bad.
I often think about the failed US Heinlein describes in “I Will Fear No Evil” and “Friday.”