It's just not too clear where the movie makers were trying to go with this adaptation of the Edgar Burroughs story. At first glance, it looks to be a tribute to the style of old drive-in sci-fi features, where an intrepid astronaut pioneers unchartered space. Along the way, our space hero will bravely fight giant creatures, duel bad guys, establish friendship with the Martian locals, romance a blonde alien, bring about peace between warring tribes, overthrow a despot, and so on.
They give us all that old school sci-fi stuff, but there's no cohesion to anything. The "plot" is just a parade of unlinked chapters. The story is modernized, which is a mistake. Yes, everybody knows the Rovers have found nothing up there, but who cares? Keep the naive retro feel of a mysterious and foreboding Mars. That was the fun of the source material. But now, the action doesn't even occur on Mars! The 19th century soldier turned Spaceman Spiff has been redone as a Gulf War Marine, and sports millennial tattoos. The Princess herself is Xena Warrior Princess one moment, and helpless fairy tale princess the next.
Still, those Martian green celery-head guys were lovable (even though you can see skin poking out from beneath the masks). The indigenous bug creatures, and the fights against them, are amusingly cheap, yet done with gusto. Overall, an amateurish film, but has a bit of odd charm to it.