Watching "Operation Delta Force 3", it soon became clear that the filmmakers were trying extremely hard to deliver the goods on a small budget. The movie keeps jumping from one different location to another, and while the various locations (underground tunnel, nuclear submarine, Pentagon Headquarters, etc.) do look a little impoverished, you can tell the filmmakers really squeezed every last penny of their small budget. The action sequences jump from place to place as well, and you get more elaborate action sequences than you usually get from a low budget actioner.
But there are some significant problems with the movie. None of the characters are fleshed out or really stand out from each other. There is poor continuity at times. There are some glaring plot holes, like why don't the good guys simply blow up the hijacked submarine. And while the action scenes are elaborate, often they are executed in a sluggish manner.
Still, the movie is never boring, and it has that other stuff I described in the first paragraph. I recommend that you watch the movie while you are doing something else at home - sewing, chopping vegetables, doing your taxes etc. It's a movie that's best not examined very closely, which would reveal more of its weaknesses if you watched it in a straightforward way.