I've read the book, and seen the movie. Let me tell you, I can't say that anything more than a skimming of that book is necessary. It's about as one dimensional as sci-fi gets. Worse even than Scott Cards work, and I don't say that lightly. Both Enders Game and Starship Troopers replace that tedious work of actually figuring out what sort of character development you want to be in your story with "young naive guy matures as he learns the value of war."

The movie, for all of its self-aware cheese, has much more to offer.

I never read Starship Troopers (actually, never knew it existed) but always enjoyed it as a fun movie. I know, fun and dumb do overlap at certain points, and maybe that's why I liked it. I like one of the comments here describing it as "Ken and Barbie go to outer space" or something like that - sums it up well for me.