I read a lot, and I feel quite confident in saying that Robert A. Heinlein is the single worst author I've ever had the extreme displeasure of reading. Since he is inexplicably considered one of the giants in SF literature, I gave him a chance and read quite a few of his books, including Friday, Starship Troopers, Farnham's Freehold, The Moon is a Harsh Mistress, and his "classic" novel, Stranger in a Strange Land. Without fail, every one of them is an insipid, juvenille mish-mash of lifeless characters and ridiculously bad prose. I've read Watchtowers containing more reasonable writings. Life is to short to waste by subjecting yourself to talentless hacks like Heinlein. Pick ANY other SF writer and you'll get a better read.