Starship Troopers

Big fan of the movie but never read the book, until now. Some give it negative reviews due to the vast differences between the two, the fact that the book concentrates mainly on the troops training and character development, whereas the movie more on the fighting. I liked those differences. In this way, the two complement each other and you can go from one to the other and see a journey.
Others say it is not really science fiction but of course it is, with its battle suits and arachnid beings, just subtly done.
As for Heinlein displaying too much of his political views? Don't a lot of writers? Aren't a writers opinions the basis of many books?