There are just a few important things you need to know to understand what Starship Troopers (the movie version) is all about. First, it does not have the same feel as Heinlein’s book. A lot of the pro-military sentiment was clearly over the top and came across as almost a parody of the original. Many of the events are preserved, but a lot of details are added of necessity, since you have to see things in a movie even if they weren’t described in the book. However, a lot of character development and relationships between characters are added too. The sharp military feel is preserved though and I thought the dry humor was brought out more. Personally, I enjoyed these changes and even felt like the movie makers probably had many of the same complaints I did with the book. But it’s possible that if you loved the book, you could find the changes frustrating.
The second thing you should know is that a lot of this movie really is overdone. It’s both very, very gory and quite campy. If you’re squeamish about blood or bugs, this might not be the movie for you. Likewise if you want a “good” movie (ie with redeeming cinematic qualities) this movie is also not for you. It’s far better for watching when you’re in the mood to enjoy laughing at how bad a movie is. I honestly don’t say that as a bad thing, since I watch campy movies with friends all the time. If you’re a real film critic type though, I think you deserve a warning about this one. At the end of the day, the gore in this one was some times a bit much for me even though it was over-the-top enough other’s might find it funny. I did enjoy the movie slightly more than the book, but neither was really my cup of tea.