It is many, many years since I read this novel, which is one of Heinlein's most loved and most reviled works. Starship Troopers won Heinlein a "best novel" Hugo Award, but it is despised by most academic critics and many others.
From my viewpoint, it is a key novel in Heinlein's oeuvre, but also in science fiction's tradition as a literature of ideas. Does that mean I actually agree with its ideas? No. There is much, I think, to view with horror! Yet, this book is written off by many people who seen unwilling to grapple with its merits, it philosophy, and its complexities. Up to a point, it can reasonably be viewed as militarist propaganda. But at the same time, it is an important and thoughtful didactic novel that deserves careful, imaginative engagement and some nuanced discussion. I have about 50 pages to go, and I'll give it some sort of review very soon.