Yeah, I really can't stomach late-period Heinlein at all. He really kind of went off the rails. I'd agree with your opinion that most of the later books were garbage when they came out. Even Moon Is A Harsh Mistress is half-and-half for me, as the story is interlarded with a lot of lecturing from the author, of the know-it-all, hectoring, obnoxious-libertarian-asshole mode already familiar from Starship Troopers. Still, I have a sentimental attachment to many of his juveniles, and even managed to get my older son into some of them.