A classic, if light, SF comedy novel becomes a tired and dragging mess. Some writers and directors have the talent and ability to overcome the limitations of a low budget, to show what they are capable of - but in this film there is nothing to suggest they could ever raise themselves above straight to video and 3am showings.
"Rescue the girl, kill the bad guy, save the world" and that's what they do - it's a good indication of the level of the dialogue as well. Which is an over the top boys own ripping yarn and knows it and plays up to it. Load up with junk food and beer and friends and switch off your brain.