It's a fun movie in its own right but it completely misses the point of the book. The point of the book is to showcase an alternative to the political systems we had in the 20th century, it wasn't just about killing space bugs. It's also a demonstration of leadership in the military, how to delegate power and responsibilities, how to act as a soldier, a NCO and as an officer.
The director was some leftist who hated the book and openly talked about it.
I wonder if they could ever make a movie about Farnham's freehold.