You'll notice that I didn't give any sort of story recap because, honestly, the story doesn't matter at all. There's something about a ship hijacked by bugs that's heading to Earth — but do you really care? You're likely watching this movie just to escape and have some fun, assuming there was any fun to be had from watching Invasion — there isn't.
The only thing worth commenting on is the decent voice cast. The dialogue is the typical heroic banter, but at least the acting isn't all that bad. These are soldiers fighting giant space bugs, so don't expect to be hooked by the narrative. Still, the script is adequate considering the subject matter.
One random thing I have to comment on is that some of the film's sound effects are straight out of video games. I've played a lot of Halo in my life, and I know the sound of Spartan weapons when I hear them. All this serves to do is drive home this overwhelming feeling that Invasion isn't a movie at all — it's a video game that couldn't find a way to be interactive.
On that note, I find it difficult to give Starship Troopers: Invasion a star rating. It's hard to find a standard in which to judge the film. This is a movie that feels like a video game, and it seems to exist only to serve fans of the series. I'm not sure even hardcore Starship Troopers fans will like Invasion, but I admit that I'm not the movie's target audience.
The extras on this direct-to-video release are the typical fare: a behind the scenes look, deleted scenes, and a strange "bloopers" reel with a few minutes of comical audio. You can also watch the film with commentary by the director Shinji Aramaki, if for some reason you have the desire to see Invasion a second time. I doubt you'll even glance at the extras, let alone watch them all. The movie isn't very good, and these generic additions certainly won't change that fact.