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Maybe I'll give that a go out of curiousity.
Well, the book is an all-out glorification of macho militarism. You might want to follow it up with Haldeman's "Forever War" as an antidote. Heinlein wrote some interesting stuff, but a fair number of his books are just nasty, not quite tipping into fascism but really dodgy and unpleasant.
He wrote much worse things than Starship Troopers, though. I hesitate to name them in case some poor soul reads one and discovers that there just isn't enough mind bleach in the world.
If you read the book first, the film makes a lot more sense. In the send that it takes the piss out of the book.
Do you want to know more?