The novel Starship Troopers is indeed excellent, especially considering Heinlein's political views, and the fact that we were deep in the "Red Scare" at the time.
The movie, while certainly omitting portions of the novel [the combat suits, for example], was still good in its way, although it seemed to be more mocking Heinlein's views or at least exaggerating them ironically than reiterating them.
But even standing alone, ST the movie made its own social commentaries.
IIRC ST2 didn't even go straight to video, it played on SciFi first, then to video. I haven't seen it, but I've heard horrible things about it. Plus, I liked the first so much, odds are against the second being anywhere near as enjoyable.
Side note: something like the last 5 movies Elizabeth Hurley has been in, have gone straight to video. She
s going to be looking for a new job soon.