I knew for a long time that Heinlein fans HATED the movie, so I finally got around to reading it. Here comes the heresy - the movie was much more entertaining than the book. The book was endless pontification with rather mundane battle scenes and weak characters. "The Moon is a Harsh Mistress" was a far far better Heinlein book that covered much of the same political ground.
The one thing that has always bothered me about the movie though is the absolutely sub-standard weaponry the humans carried. If you have to shoot something a few hundred times to bring it down, you very obviously need a more powerful weapon. You're in the freaking future, for godsakes! Invent something that stops them in one shot.
***Invent something that stops them in one shot. ***
DDT or Chlordane works wonders.