After hearing about how controversial Stranger in a Strange Land was when it was published, I had to read it. I really enjoyed it. Reading other reviews, I realize that there are a lot of hugely problematic gender issues on the book, some of which I noticed and some of which I seem to have skimmed over. That said, I still found it fascinating, enjoyable, and a really good book. I feel that Heinlein really had something when Mike talks about grokking why humans laugh. It continues to strike me as particularly profound the insight that humans laugh to deal with the painful and frightening.
Summary: problematic? Yes. Also a really interesting book, well worth reading.